超临界旁路排放小孔稳态流场数值模拟研究  

Numerical Simulation Study on Steady State Flow Field of Supercritical Bypass Discharge Orifice

作　　者：刘宇阳 张东洋 潘思言 张昊 LIU Yuyang;ZHANG Dongyang;PAN Siyan;ZHANG Hao(No.703 Research Institute of CSSC,Harbin,China,150078)

机构地区：[1]中国船舶集团有限公司第七○三研究所,黑龙江哈尔滨150078

出　　处：《热能动力工程》2025年第1期69-75,共7页Journal of Engineering for Thermal Energy and Power

摘　　要：为了实现旁路排放箱级间小孔在超临界状态下的结构设计并获得其节流特性,通过建立小孔超临界压比排放的计算模型,采用三维数值模拟的方法,对不同排放参数、不同小孔结构下的节流特性进行了数值模拟研究,获得了小孔最大马赫数和流量随膨胀比的变化规律及孔径对小孔节流特性的影响,分析了小孔节流减压的作用机理。研究结果表明:计算结果与理论计算值误差为1.04%;通过对排放压力5.0和0.1 MPa两个极端工况进行模拟,计算得到直径d_(0)=10 mm小孔的极限流量分别为0.3304和0.007225 kg/s。In order to realize the structural design of orifice between stages of bypass discharge box and obtain the throttling characteristics of the supercritical discharge orifice model in supercritical state,through establishing a calculation model for the supercritical pressure ratio discharge of the orifice,by means of 3D numerical simulation,numerical simulation research on the throttling characteristics of the supercritical discharge orifice model under different emission parameters and different orifice structures was conducted.The variation of the maximum Mach number and flow rate of the orifice with the expan-sion ratio,as well as the influence of the aperture on the orifice throttling characteristics were obtained.The mechanism of the orifice throttling pressure reduction was analyzed.The research results show that the deviation between calculated result and theoretical result is 1.04%.Under two extreme operating conditions,namely the discharge pressure of 5.0 and 0.1 MPa,the limit flow rates of the orifice with a diameter of 10 mm are calculated to be 0.3304 and 0.007225 kg/s,respectively.

关 键 词：动力装置 超临界排放 小孔节流 数值模拟 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]