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Numerical simulation and characteristic comparison of sonic nozzle

机译：声波喷嘴的数值模拟和特性比较

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As the main standard flowmeter, Sonic nozzle has been widely used in aerospace, petrochemical and biomedical fields. Recently, a number of studies have been conducted on small-scale sonic nozzles. Since the standard ISO sonic nozzle is difficult to process at a small scale, the geometry of the shrink nozzle, the diffusion nozzle and the conical venturi nozzle is proposed based on the circular ISO nozzle, and the geometric structure and shape flow to the nozzle. A preliminary analysis of the effects of the characteristics was carried out. In this paper, the computational fluid dynamics method is used to numerically simulate the flow field inside the three sonic nozzles. The influence of the geometry of the constricted section, the throat and the diffusing section on the nozzle flow characteristics is analyzed and compared with the annular ISO nozzle. In contrast, the flow characteristics of four kinds of microsonic nozzles are compared. Considering the feasibility of actual processing, the geometric structure with better discharge coefficient and critical back pressure ratio is obtained, which provides a reference for the development of micro nozzles.
机译：作为主要的标准流量计，声波喷嘴已广泛应用于航空，石化和生物医学领域。最近，对小型声波喷嘴进行了许多研究。由于标准ISO声波喷嘴难以进行小规模加工，因此基于圆形ISO喷嘴提出了收缩喷嘴，扩散喷嘴和锥形文丘里喷嘴的几何形状，并提出了向喷嘴流动的几何结构和形状。对特性的影响进行了初步分析。在本文中，使用计算流体动力学方法来数值模拟三个声波喷嘴内部的流场。分析了收缩段，喉部和扩散段的几何形状对喷嘴流动特性的影响，并与环形ISO喷嘴进行了比较。相反，比较了四种超声喷嘴的流动特性。考虑到实际加工的可行性，获得了具有更好的排量系数和临界背压比的几何结构，为微型喷嘴的研制提供了参考。

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