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Papers by Raj Kumar Chaulagain

Research paper thumbnail of Graphical Exploration for an Economic Diameter of Penstock Pipe: A Case Study of Middle Kali Gandaki Hydropower Project, Nepal

Research paper thumbnail of Experimental comparison of the upstream head using the non-rotating model of the vertical ultra-low head hydro turbine with its prototype

Journal of physics, Oct 31, 2023

Research paper thumbnail of Design and experimental analysis of a new vertical ultra-low-head hydro turbine with the variation of outlet flow level on the head drop section of an open canal

Results in engineering, May 1, 2024

Research paper thumbnail of Computational and Experimental Analysis of Conical Draft Tube's Effect on Conical Basin of Gravitational Water Vortex Turbine

Journal of advance college of engineering and management, Jun 23, 2023

Research paper thumbnail of A review on non-conventional hydropower turbines and their selection for ultra-low-head applications

Research paper thumbnail of Experimental investigation on flow approach profile for comparison of surface velocity at the inlet of the vertical ultra-low head hydro turbine using a non-rotating model

Engineering Science and Technology, an International Journal

Research paper thumbnail of Simulation of Propeller Runner for Cylindrical Basin of Gravitational Water Vortex Power Plant

Advances in Engineering and Technology: An International Journal

The gravitational water vortex power plant is an emerging technology of power generation from wat... more The gravitational water vortex power plant is an emerging technology of power generation from water vortex in a small amount. It can generate electricity in a low head of range (0.7-2m). This system is very simple and requires less keep-up. This research aims to develop the propeller type runner which gives optimum efficiency and cylindrical basin suitable for this propeller runner in GWVPP. The research has been conducted by developing a new propeller runner and cylindrical basin considering the top surface open as the atmosphere. Blade angle, discharge hole diameter of the basin, the position of runner, and rpm are optimized on CFD-based optimization. After the CFD analysis, the optimum blade angle was 43º, exit hole diameter of this basin was found 175 mm which is 20% of the basin diameter. The optimum height was found 785mm which is 65.42% of the total height. And the efficiency of the optimized system was 23.639 % at 40 rpm.

Research paper thumbnail of Performance Testing of Foldable Electric Powered Wheelch

Journal of Innovations in Engineering Education

This paper aims to design and test a foldable, lightweight wheelchair propelled by a pair of elec... more This paper aims to design and test a foldable, lightweight wheelchair propelled by a pair of electric motors. Starting from literature review, the research team carried out the design and solid modeling of proposed wheelchair. Solidworks software was used to make the computer model. The wheelchair frame comprised of a chair like frame with two pairs of wheels on front and back. The defined electric wheelchair is completed with the coordination of manual and electric system. A pair of electric motor is fitted on wheels at backside which are controlled by the electronic controller powered by the battery. The folding mechanism developed on the wheelchair was aimed for ease of transport and storage. The frame material was selected to be aluminum alloy. Lithium ion battery and geared electric motors were used in the prototype and motion control was done by joystick. Locking mechanism was used for frame locking during operation. The prototype was subjected to different tests. The unfolded...

Research paper thumbnail of The 3D printing technology and its application in Nepalese context

Journal of Innovations in Engineering Education

3DP has become popular on manufacturing platform that enables users to create customizable produc... more 3DP has become popular on manufacturing platform that enables users to create customizable products through digital design. In context of 3DP's application in developing countries, Nepal is at an early stage. This paper presents a brief review of 3DP technology and case study conducted through survey on application of 3DP in Nepalese environment. The research showed presently professional and research based organization holds higher coverage among 40 different organizations spread over seven districts of the country. Though the technology is in use since 2011, it was found increasing from 2015 only. Product examples of 3DP application in Nepal were found more concerned to medical consumables and student project components. The findings of research are discussed plotting different graphs and moreover concluded with brief opportunity and challenges of using 3DP in Nepal.

Research paper thumbnail of Design, fabrication and testing of hydro turbine with composite path runner for ultra-low head application

Journal of Innovations in Engineering Education

This paper is focused on design a turbine with composite path runner for ultra low head applicati... more This paper is focused on design a turbine with composite path runner for ultra low head application and finally analyze its performance under different test conditions. Literature review was the starting point of research and detailed design parameters for the turbine dimensions and materials were selected taking feasibility of fabrication and testing in hand. The testing was proposed on real site of Bagmati river at Kupandole, Lalitpur, Nepal where the turbine was subjected to fuse reeflowing water from the head of 1.3m and flowrate of 78 LPS that taken as site parameter. The 3D model for the turbine was developed in CATIA. For turbine height of 0.77m and runner minor diameter of 0.152m, simulations were carried out to find the most feasible number of blades, blade width, blade spacing, number of guide vanes and guide vane spacing using ANSYS simulation. Among the simulation the best arrangement was blade radial width of 62 mm, blade spacing of 54mm, guide vane spacing of 36.5 mm, ...

Research paper thumbnail of Design , Fabrication and Testing of Hydraulic Ram Pump with Water Recirculation System

This research was focused on introducing water recirculation system in hydraulic ram pump so as t... more This research was focused on introducing water recirculation system in hydraulic ram pump so as to reuse excessive waste water and make the pump operatable in dry seasons when the inlet flowrate is low. Necessary design parameters were determined after desk study and literature review. The currently working AIDFI pump was studied and a new pump of same size was developed so as to introduce water recirculation system. To aid the statement of increase in volumetric efficiency of the pump, 1” model pump was built along with test system and test was carried out. Then with necessary altercations, 3” mild steel pump was fabricated and tested in Jharuwarashi-Badegaun, Lalitpur. The result showed that around 1.48% increased efficiency at around 57.17% of inlet flow rate by introduction of recirculation system and similarly the result obtained at other inlet flowrates showcased the feasibility and improvement in efficiencies by the addition of recirculation system.

Research paper thumbnail of Economic Feasibility Study of Gravitational Water Vortex Power Plant for the Rural Electrification of Low Head Region of Nepal and Its Comparative Study with Other Low Head Power Plant

The research work on GWVPP till now have found that the different geometrical parameters like (i)... more The research work on GWVPP till now have found that the different geometrical parameters like (i) basin opening, (ii) basin diameter, (iii) notch length, iv) canal height, and v) cone angle are predominant in the design of basin structure of the Gravitational Water Vortex Power Plant and also shown that the conical basin structure is more efficient than cylindrical basin structure. The study shows that the conical basin structure have 75% efficiency which is about twice more efficiency than the cylindrical basin structure. The past experimental study on three profiles of runners for GWVPP also shows that the runner having curved profile is more efficient than straight profile. Hence the gravitational water vortex power plant is now in the final stage of commercialization in Nepal. So this study encompass the economic feasibility study of the optimized conical basin and runner for the GWVPP in context of Nepal and the economic aspect of conical basin structure is compared with the ec...

Research paper thumbnail of Graphical Exploration for an Economic Diameter of Penstock Pipe: A Case Study of Middle Kali Gandaki Hydropower Project, Nepal

Research paper thumbnail of Experimental comparison of the upstream head using the non-rotating model of the vertical ultra-low head hydro turbine with its prototype

Journal of physics, Oct 31, 2023

Research paper thumbnail of Design and experimental analysis of a new vertical ultra-low-head hydro turbine with the variation of outlet flow level on the head drop section of an open canal

Results in engineering, May 1, 2024

Research paper thumbnail of Computational and Experimental Analysis of Conical Draft Tube's Effect on Conical Basin of Gravitational Water Vortex Turbine

Journal of advance college of engineering and management, Jun 23, 2023

Research paper thumbnail of A review on non-conventional hydropower turbines and their selection for ultra-low-head applications

Research paper thumbnail of Experimental investigation on flow approach profile for comparison of surface velocity at the inlet of the vertical ultra-low head hydro turbine using a non-rotating model

Engineering Science and Technology, an International Journal

Research paper thumbnail of Simulation of Propeller Runner for Cylindrical Basin of Gravitational Water Vortex Power Plant

Advances in Engineering and Technology: An International Journal

The gravitational water vortex power plant is an emerging technology of power generation from wat... more The gravitational water vortex power plant is an emerging technology of power generation from water vortex in a small amount. It can generate electricity in a low head of range (0.7-2m). This system is very simple and requires less keep-up. This research aims to develop the propeller type runner which gives optimum efficiency and cylindrical basin suitable for this propeller runner in GWVPP. The research has been conducted by developing a new propeller runner and cylindrical basin considering the top surface open as the atmosphere. Blade angle, discharge hole diameter of the basin, the position of runner, and rpm are optimized on CFD-based optimization. After the CFD analysis, the optimum blade angle was 43º, exit hole diameter of this basin was found 175 mm which is 20% of the basin diameter. The optimum height was found 785mm which is 65.42% of the total height. And the efficiency of the optimized system was 23.639 % at 40 rpm.

Research paper thumbnail of Performance Testing of Foldable Electric Powered Wheelch

Journal of Innovations in Engineering Education

This paper aims to design and test a foldable, lightweight wheelchair propelled by a pair of elec... more This paper aims to design and test a foldable, lightweight wheelchair propelled by a pair of electric motors. Starting from literature review, the research team carried out the design and solid modeling of proposed wheelchair. Solidworks software was used to make the computer model. The wheelchair frame comprised of a chair like frame with two pairs of wheels on front and back. The defined electric wheelchair is completed with the coordination of manual and electric system. A pair of electric motor is fitted on wheels at backside which are controlled by the electronic controller powered by the battery. The folding mechanism developed on the wheelchair was aimed for ease of transport and storage. The frame material was selected to be aluminum alloy. Lithium ion battery and geared electric motors were used in the prototype and motion control was done by joystick. Locking mechanism was used for frame locking during operation. The prototype was subjected to different tests. The unfolded...

Research paper thumbnail of The 3D printing technology and its application in Nepalese context

Journal of Innovations in Engineering Education

3DP has become popular on manufacturing platform that enables users to create customizable produc... more 3DP has become popular on manufacturing platform that enables users to create customizable products through digital design. In context of 3DP's application in developing countries, Nepal is at an early stage. This paper presents a brief review of 3DP technology and case study conducted through survey on application of 3DP in Nepalese environment. The research showed presently professional and research based organization holds higher coverage among 40 different organizations spread over seven districts of the country. Though the technology is in use since 2011, it was found increasing from 2015 only. Product examples of 3DP application in Nepal were found more concerned to medical consumables and student project components. The findings of research are discussed plotting different graphs and moreover concluded with brief opportunity and challenges of using 3DP in Nepal.

Research paper thumbnail of Design, fabrication and testing of hydro turbine with composite path runner for ultra-low head application

Journal of Innovations in Engineering Education

This paper is focused on design a turbine with composite path runner for ultra low head applicati... more This paper is focused on design a turbine with composite path runner for ultra low head application and finally analyze its performance under different test conditions. Literature review was the starting point of research and detailed design parameters for the turbine dimensions and materials were selected taking feasibility of fabrication and testing in hand. The testing was proposed on real site of Bagmati river at Kupandole, Lalitpur, Nepal where the turbine was subjected to fuse reeflowing water from the head of 1.3m and flowrate of 78 LPS that taken as site parameter. The 3D model for the turbine was developed in CATIA. For turbine height of 0.77m and runner minor diameter of 0.152m, simulations were carried out to find the most feasible number of blades, blade width, blade spacing, number of guide vanes and guide vane spacing using ANSYS simulation. Among the simulation the best arrangement was blade radial width of 62 mm, blade spacing of 54mm, guide vane spacing of 36.5 mm, ...

Research paper thumbnail of Design , Fabrication and Testing of Hydraulic Ram Pump with Water Recirculation System

This research was focused on introducing water recirculation system in hydraulic ram pump so as t... more This research was focused on introducing water recirculation system in hydraulic ram pump so as to reuse excessive waste water and make the pump operatable in dry seasons when the inlet flowrate is low. Necessary design parameters were determined after desk study and literature review. The currently working AIDFI pump was studied and a new pump of same size was developed so as to introduce water recirculation system. To aid the statement of increase in volumetric efficiency of the pump, 1” model pump was built along with test system and test was carried out. Then with necessary altercations, 3” mild steel pump was fabricated and tested in Jharuwarashi-Badegaun, Lalitpur. The result showed that around 1.48% increased efficiency at around 57.17% of inlet flow rate by introduction of recirculation system and similarly the result obtained at other inlet flowrates showcased the feasibility and improvement in efficiencies by the addition of recirculation system.

Research paper thumbnail of Economic Feasibility Study of Gravitational Water Vortex Power Plant for the Rural Electrification of Low Head Region of Nepal and Its Comparative Study with Other Low Head Power Plant

The research work on GWVPP till now have found that the different geometrical parameters like (i)... more The research work on GWVPP till now have found that the different geometrical parameters like (i) basin opening, (ii) basin diameter, (iii) notch length, iv) canal height, and v) cone angle are predominant in the design of basin structure of the Gravitational Water Vortex Power Plant and also shown that the conical basin structure is more efficient than cylindrical basin structure. The study shows that the conical basin structure have 75% efficiency which is about twice more efficiency than the cylindrical basin structure. The past experimental study on three profiles of runners for GWVPP also shows that the runner having curved profile is more efficient than straight profile. Hence the gravitational water vortex power plant is now in the final stage of commercialization in Nepal. So this study encompass the economic feasibility study of the optimized conical basin and runner for the GWVPP in context of Nepal and the economic aspect of conical basin structure is compared with the ec...