and a compared bell nozzle were designed to gain the performance characteristics of plug nozzle.The thrust performances of the nozzles were evaluated with numerical simulation method.A ground hot test was done to measure the thrust performance the clustered plug nozzle.The result shows that the numerical simulation results of the flow phenomenon and thrust performance accord with the experimental results.The thrust efficient of the plug nozzle in ground reaches 92.6% and is 9.1% higher than the bell nozzle with the same area ratio and length
reflecting the altitude compensation effects of plug nozzle.However
its thrust efficient in high attitude is 5.8% lower than the compared bell nozzle.