液体喷嘴动态特性数值模拟

对直流、离心喷嘴进行了理论分析,采用"频率法"对直流和离心喷嘴的动态特性进行了数值模拟,所得结果表明:增加振荡频率会导致直流和离心喷嘴流量的振幅降低和相移增大,而增大压降则结果相反;在相同工况下,当直流喷嘴增大长径比或离心喷嘴增大几何特性时均会导致振幅降低和相移增大,离心喷嘴喷口长度增大导致相移增大,而对振幅无明显影响。此结果与国外研究结果符合较好,并为进一步开展喷嘴动力学研究奠定了基础。

Numerical Simulation of Liquid Injector Dynamics

In order to study the dynamic characteristics of liquid rocket engine injectors,theoretical analysis has been carried out for the plane orifice and centrifugal injectors."Frequency Method" was used for the numerical simulation of the injector dynamics.The results show that with the increase of pulse frequency,the flux swing of the plane orifice and centrifugal injectors decreases and the phase shift increases.With the increase of pressure,the flux swing increases and the phase shift decreases.Under the same condition,with the increase of the plane orifice injector's length or the geometric characteristics of centrifugal injectors,the swing decreases and the phase shift increases.With the increase of the spout length of centrifugal injectors,the phase shift increases while the swing is not affected remarkably.These results agree well with foreign investigations and establish the basis for further study.