On the Reflective Conditions of Pressure Wave in Some Exhaust Pipe Systems Measured by the Shock-Tube Method

Abstract

In the present paper, the reflective conditions of pressure wave in the exhaust pipe systems with diffusers, nozzles, bends or elbows, and in the exhaust manifolds were measured by the shock-tube method. This method was based on the characteristic relation of pressure wave and the shock-tube principle. Some results obtained were as follows : 1) As to nozzle, the experiments showed the coincidence with the theory for a weak shock wave, but as strength of its incident pressure increased, the discharge coefficients became larger. 2) Judging from the theory and the experimental results, the diffuser effect could not be improved for the area ratio above 4. 3) As to bends or elbows, the experimental results agreed well with the theoritical one. 4) The results were able to clearly explain the phenomena in the last experiments using uniflow two-cycle diesel engine.