Search Results

This paper describes a theoretical and experimental investigation of the noise characteristics of some basic internal combustion engine exhaust systems. On the basis of a one-dimensional analysis of the unsteady internal flow, the treatment is extended to consider the noise radiated by the efflux of gas from the atmospheric termination of the tail pipe. Using a rotary valve exhaust simulator, experimental pressure-time histories and one-third octave noise spectrograms were obtained. These are compared with those calculated.

This paper describes some of the experimental and theoretical work carried out at the Queen's University, Belfast in connection with a pulsejet project. It starts from the earliest stages of trying to achieve a working reed valved engine and continues to the present where valve less pulsejets have been designed with the aid of a simulation program. Suggestions are made regarding the manner in which various parameters such as duct and intake geometry, orientation and flight speed can affect performance. It suggests four main criteria which must be fulfilled for any valveless pulsejet to operate successfully and discusses methods by which these can be achieved.