Interaction of travelling shock waves with orifices inside ducts (original) (raw)

1971, International Journal of Mechanical Sciences

When a shock wave moves down in a duct and reaches an orifice plate located inside it, reflected and transmitted shocks appear. A theoretical model to estimate such effects has been outlined, and experiments have been carried out measuring pressures upstream and downstream of the orifice. The experimental results obtained agree fairly well with the theoretical ones. Some anomalous phenomena have been observed, probably due to unsteady boundary layer growth or time lag in the establishment of steady-flow conditions through the orifice. NOTATION a acoustic velocity d orifice hole diameter f contact surface i incident shock wave m = d~/D 2 constriction factor p pressure r reflected shock wave s axial thickness of the orifice t transmitted shock wave u gas velocity A cross-section D pipe diameter K discharge coefficient M Mach number T temperature ae = AdA~ fl = pip, ratio of specific heats St~fixes i, r, t refer to the incident, reflected and trar~mitted shock waves Suffix e denotes the conditions in the minimum area A e Numbers 0, 1, 2, 3 and 4 refer to the regions drawn in Fig. 1

Sign up for access to the world's latest research.

checkGet notified about relevant papers

checkSave papers to use in your research

checkJoin the discussion with peers

checkTrack your impact