Numerical Study on the Effect of the Nozzle Pressure Ratio on the Starting Characteristics of the Axisymmetric Divergent Dual Throat Nozzle

IF 1 4区工程技术 Q4 MECHANICS

Fluid Dynamics Pub Date : 2024-07-05 DOI:10.1134/S0015462823603297

Y. S. Wang, J. L. Xu, S. Huang

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Abstract

The effect of nozzle pressure ratio (NPR) on the starting characteristics of an axisymmetric divergent dual throat nozzle is investigated numerically. The steady and unsteady numerical simulation methods are used to study the internal flow field of the nozzle and variation in the related performance parameters as a function of the nozzle pressure ratio. The results show that for change in the total pressure of the nozzle inlet flow or back pressure under the same nozzle pressure ratio, the flow field structures in the nozzle cavity remains basically the same, and there is a little difference between the unsteady numerical simulation results and the corresponding time-independent numerical simulation results. In addition, the discharge coefficient of the nozzle increases rapidly with the increase of the nozzle pressure ratio, and then changes only slightly when the nozzle pressure ratio reaches a certain value. With increase in the nozzle pressure ratio, the thrust coefficient of the nozzle will oscillate in the initial stage, then gradually decrease, and then slowly increase, and suddenly decrease near the critical nozzle pressure ratio (NPR_cr), and then gradually increase. The typical flow field structures in the cavity under the starting and non-starting conditions are presented before and after reaching the critical nozzle pressure ratio at which the thrust coefficient of the nozzle suddenly drops.

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喷嘴压力比对轴对称发散双喉喷嘴启动特性影响的数值研究

摘要数值研究了喷嘴压力比（NPR）对轴对称发散双喉喷嘴起动特性的影响。采用稳定和非稳定数值模拟方法研究了喷嘴内部流场以及相关性能参数随喷嘴压力比的变化。结果表明，在喷嘴压力比不变的情况下，喷嘴入口流体总压或背压发生变化时，喷嘴腔内流场结构基本不变，非稳态数值模拟结果与相应的时变数值模拟结果差别不大。此外，喷嘴的排流系数随喷嘴压力比的增大而迅速增大，当喷嘴压力比达到一定值时，排流系数仅发生微小变化。随着喷嘴压力比的增大，喷嘴的推力系数在初始阶段会出现振荡，然后逐渐减小，然后缓慢增大，在临界喷嘴压力比（NPRcr）附近突然减小，然后逐渐增大。在达到喷嘴推力系数突然下降的临界喷嘴压力比之前和之后，给出了空腔在启动和非启动条件下的典型流场结构。

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来源期刊

Fluid Dynamics MECHANICS-PHYSICS, FLUIDS & PLASMAS

CiteScore

1.30

自引率

22.20%

发文量

审稿时长

6-12 weeks

期刊介绍： Fluid Dynamics is an international peer reviewed journal that publishes theoretical, computational, and experimental research on aeromechanics, hydrodynamics, plasma dynamics, underground hydrodynamics, and biomechanics of continuous media. Special attention is given to new trends developing at the leading edge of science, such as theory and application of multi-phase flows, chemically reactive flows, liquid and gas flows in electromagnetic fields, new hydrodynamical methods of increasing oil output, new approaches to the description of turbulent flows, etc.