Abstract:

In order to obtain the thrust performances of plug nozzles rapidly and correctly, a mathematical model of the pressure distribution on plug wall is established by theoretical analysis with combination of the flow phenomena in plug nozzles. Based on the mathematical model, thrust models for the plug nozzle with full length and truncated central body are established. Through comparison and analysis, the results got from the model are quite consistent with experiment results, implying that the mathematical model of pressure distribution and the thrust models are effective and can work as effective tools in the performance evaluation of plug nozzles.

Key words: rocket engine, plug nozzle, thrust coefficient