脉冲爆震发动机模型机平均推力特性计算与实验研究

Calculation and experimental investigation on average thrust characteristics of a model pulse detonation engine

针对如何确定脉冲爆震发动机平均推力的问题,介绍了体积比冲估算法、推力壁压力曲线积分法和弹簧-质量-阻尼系统法的计算与测量原理。建立了PDE模型机推力测试台架系统。同时采用推力壁压力曲线积分法和弹簧-质量-阻尼系统法对一PDE模型机在不同频率多循环工况下的平均推力特性进行实验研究。对比分析了体积比冲估算法、推力壁压力曲线积分法和弹簧-质量-阻尼系统法所获得的PDE模型机平均推力计算值与实验值,发现:PDE模型机的平均推力随工作频率的升高基本上呈线性增加;同一工作频率下,采用体积比冲估算法得到的平均推力最大,推力壁压力曲线积分法次之,弹簧-质量-阻尼系统法最小;PDE模型机平均推力应处于推力壁压力曲线积分法与弹簧-质量-阻尼系统法所测推力之间。

Aimed at the problem of how to determine the pulse detonation engine （PDE） average thrust, the computing and measuring principles of volume impulse estimating method and thrust wall pressure cure integral method and spring-mass-damper system method were discussed in this paper. A thrust test stand was built up. Using thrust wall pressure integration method and spring-mass-damper the average thrust characteristics of a model pulse detonation engine operated in system method synchronously, variety frequencies were investigated experimentally. The computing and experimental value of average thrust obtained respectively by volume impulse estimating method and thrust wall pressure integration method and spring-mass-damper system method were contrasted and analyzed. The following conclusions were made that the average thrust of the model PDE was increasing linearly along with the increasing of operating frequency and the average thrust obtained by vol- ume impulse estimating method was bigger than what obtained by thrust wall pressure cure integral method, and the spring-mass-damper system method was the smallest one. It was estimated that the average thrust of the model PDE was between the value obtained by thrust wall pressure integration method and spring-mass-system method.