{"title":"Numerical Study on the Effect of the Nozzle Pressure Ratio on the Starting Characteristics of the Axisymmetric Divergent Dual Throat Nozzle","authors":"Y. S. Wang, J. L. Xu, S. Huang","doi":"10.1134/s0015462823603297","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>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<sub>cr</sub>), 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.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":null,"pages":null},"PeriodicalIF":1.0000,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fluid Dynamics","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1134/s0015462823603297","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MECHANICS","Score":null,"Total":0}
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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 (NPRcr), 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.
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.
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