共查询到16条相似文献,搜索用时 15 毫秒
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A study on the character of pressure wave propagation was proposed for the gas liquid oxygen two-phase flow in the pipe between pumps.According to the practical working conditions,the homogenous model based on the compressibility theory regarding a single bubble in an infinite liquid,and Redlich-Kwong gas equation was derived a model for the low temperature and high pressure case,especially considering the change of the ratio of density of gas to one of liquid.The numerical tests were conducted.The results not only show the agreement between numerical simulation for this model and experiment at the normal temperature and pressure is good,but also show that the modifications of the model for the low temperature and high pressure condition are necessary.The study is of reference to further study of oscillation restrain and relative pipe tests. 相似文献
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Shining CHAN Huoxing LIU Hang SONG Fengchao LI Chongwen JIANG Zhenxun GAO 《中国航空学报》2022,35(5):247-259
A wave rotor is suitable for compact and efficient pressure-exchange between gas flows.This work measured the circumferential pressure distribution of the rotor/stator interfaces and utilized a CFD method to simulate the unsteady pressure waves. The experimental and CFD results showed some slopes in the circumferential pressure distributions, and the slopes indicated the traces of specific unsteady pressure waves. Such traces varied regularly if the rotational speed varied within a range from-11... 相似文献
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星孔型装药发动机三维两相流场的数值模拟 总被引:6,自引:1,他引:6
为了研究颗粒在星孔型装药固体火箭发动机燃烧室和喷管中的运动轨迹以及颗粒与发动机壁面的碰撞情况,针对可压两相流动,采用了高雷诺数下的k ε湍流模型和欧拉 拉格朗日两相流模型,用全速度SIMPLE方法对方程组进行求解,并用PSIC方法进行气固耦合计算。计算得出了流场内两相的速度、温度等参数的分布及多种情况下固体颗粒的运动轨迹。在燃气生成量确定的情况下,从距离喷管较近的某些位置进入流场的颗粒比较容易撞击壁面;颗粒的尺寸和局部产生的旋涡对颗粒的轨迹和碰撞也会产生较大的影响。 相似文献
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The pintle valve is currently the most promising technology among all thrust control methods for solid rocket motors. Pintle structure and working condition play a critical role in the successful operation of a pintle motor. Here, 2D transient simulations of a pintle motor using dynamic meshing are performed. Reynolds-averaged Navier–Stokes equations are solved with the implementation of an RNG k–e turbulence model. In cold flow test, emphasis is placed on the effect of pintle structure, and in ... 相似文献
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针对某火箭发动机考虑汽化的注水气液两相流问题,研究了液态水的汽化机理。根据不同环境压力下水的饱和温度建立了汽化模型,编制适合于液态水的专用汽化相变求解程序,并通过添加汽化组分源项及热源项的方法将汽化相变计算嵌入到多相流场控制方程中,实现了考虑液态水汽化相变的三维多相流场求解。结合经典算例进行了对比,特征点的两相流场温度计算值和试验的误差控制在8.5%以内,验证了程序三维计算的可靠性。距火箭喷嘴不同距离横截面的两相质量转化率曲线显示,质量转化率从最低值上升到最高值,然后降低到最低值,揭示了考虑相变的气液两相相间反应转化机理。该方法可为运载火箭发射平台发射起始阶段水室的汽化降温提供参考。 相似文献
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《中国航空学报》2021,34(8):48-57
The objective of this paper is to investigate the effect of water temperature on cavitation characteristics in a turbopump inducer, a series of experiments at different temperatures have been conducted in a newly developed visualization test facility. It is found that higher temperature shows little influence on the non-cavitation performance and breakdown characteristic in the investigated range. The relationship between cavitation development and pressure fluctuation has been discussed in detail. Higher temperature displays a remarkable stabilization effect on the cavitation excited pressure. In particular, the inception cavitation numbers of both the super-synchronous rotating cavitation and synchronous rotating cavitation are decreased at higher temperatures, and the corresponding frequencies are not affected, while the amplitudes are distinctly reduced, and the occurrence range of synchronous rotating cavitation is significantly narrowed. A generalized Rayleigh-Plesset equation has been employed to account for the thermal effect on the bubble development, which may provide a deep insight in understanding the experimental results. Thermal effect is found to act as a remarkable dissipation mechanism to suppress the bubble growth, smooth the collapse. In particular, the excited pressure during collapse is smaller at higher temperatures, which may lead to the stabilization effect of high temperature in this study. 相似文献
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以某高负荷、跨声速压气机叶栅为研究对象,应用数值模拟手段探讨通过抽吸控制激波从而控制附面层发展的可行方法。研究结果表明:随着抽吸量的增加吸力面马赫数峰值提高,激波损失增加,同时使得吸力面马赫数峰值点位置后移,附面层分离减弱,分离的减弱所导致的总压恢复系数增加量要远大于激波强度增加所导致的总压恢复系数减小量;抽吸对叶栅性能改善存在一个最佳抽吸量1.2%;在保证叶栅静压压升不变的前提下,相对于未抽吸条件1.2%抽吸使得叶栅总压恢复系数提高10%,扩散因子降低18%,落后角减小5°;通道激波后实施附面层小流量抽吸不能有效改善附面层内部流动参数,当实现前缘入射斜激波投射点位于通道激波上游时,叶表附面层流动得到较大改善。 相似文献
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《中国航空学报》2022,35(12):102-116
Mechanically pumped two-phase loop (MPTL) which is a prominent two-phase heat transfer technology presents a promising prospect in thermal control for space payload. However, transient behavior of MPTL caused by phase-change and heat sources load-on/off in simulated space environment is rarely reported. In the present study, one MPTL setup was designed and constructed, and experimentally studied. Particularly, a novel two-phase thermally-controlled accumulator integrated with passive cooling measure and three capillary structures was designed as the temperature-control device. Dynamic behavior of the start-up, temperature control, and temperature adjustment were monitored; meanwhile, thermodynamic behavior within the proposed accumulator, the operating behavior as well as the heat and mass transfer behavior between the main loop and the accumulator were revealed. The results show that the fluid management function of the capillary structures for the novel accumulator is verified. The working point of the MPTL system can be adjusted by changing the temperature control point of the accumulator and it is little influenced by external heat flux and heat sources on/off. Pressure-drop oscillations which are manifested as fluctuations of temperature and pressure can be observed after phase changing due to the compressible volume within the accumulator and the negative-slope portion of the internal pressure. 相似文献
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The problem of aeroelasticity and maneuvering of command surface and gust wing interaction involves a starting flow period which can be seen as the flow of an airfoil attaining suddenly an angle of attack. In the linear or nonlinear case, compressive Mach or shock waves are generated on the windward side and expansive Mach or rarefaction waves are generated on the leeward side. On each side, these waves are composed of an oblique steady state wave, a vertically-moving one-dimensional unsteady wave, and a secondary wave resulting from the interaction between the steady and unsteady ones. An analytical solution in the secondary wave has been obtained by Heaslet and Lomax in the linear case, and this linear solution has been borrowed to give an approximate solution by Bai and Wu for the nonlinear case. The structure of the secondary shock wave and the appearance of various force stages are two issues not yet considered in previous studies and has been studied in the present paper. A self-similar solution is obtained for the secondary shock wave, and the reason to have an initial force plateau as observed numerically is identified. Moreover, six theoretical characteristic time scales for pressure load variation are determined which explain the slope changes of the time-dependent force curve. 相似文献