{"title":"Numerical Investigation on the Effect of Fuel-Rich Degree in the RBCC Engine under the Ejector Mode","authors":"Yizhi Yao, Mingbo Sun, Menglei Li, Peibo Li, An Bin, Rui Gu, Jiaoru Wang, Feng Wei, Taiyu Wang, Jikai Chen","doi":"10.1155/2024/4340688","DOIUrl":null,"url":null,"abstract":"The ejector mode of the Rocket-Based Combined-Cycle (RBCC) engine is characterized by high fuel consumption. This study is aimed at investigating the influence of the rocket fuel-rich degree on the RBCC engine’s performance under the ejector mode combined with simultaneous mixing and combustion (SMC). Numerical simulations were conducted for various rocket mixing ratios (<span><svg height=\"8.8423pt\" style=\"vertical-align:-0.2064009pt\" version=\"1.1\" viewbox=\"-0.0498162 -8.6359 21.065 8.8423\" width=\"21.065pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,0,0)\"></path></g><g transform=\"matrix(.013,0,0,-0.013,13.434,0)\"></path></g></svg><span></span><svg height=\"8.8423pt\" style=\"vertical-align:-0.2064009pt\" version=\"1.1\" viewbox=\"24.6471838 -8.6359 26.707 8.8423\" width=\"26.707pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,24.697,0)\"></path></g><g transform=\"matrix(.013,0,0,-0.013,30.937,0)\"></path></g><g transform=\"matrix(.013,0,0,-0.013,33.901,0)\"></path></g><g transform=\"matrix(.013,0,0,-0.013,43.773,0)\"></path></g></svg><span></span><span><svg height=\"8.8423pt\" style=\"vertical-align:-0.2064009pt\" version=\"1.1\" viewbox=\"54.9861838 -8.6359 15.753 8.8423\" width=\"15.753pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,55.036,0)\"></path></g><g transform=\"matrix(.013,0,0,-0.013,61.276,0)\"><use xlink:href=\"#g113-47\"></use></g><g transform=\"matrix(.013,0,0,-0.013,64.24,0)\"></path></g></svg>)</span></span> under subsonic (<span><svg height=\"11.8174pt\" style=\"vertical-align:-3.1815pt\" version=\"1.1\" viewbox=\"-0.0498162 -8.6359 32.873 11.8174\" width=\"32.873pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,0,0)\"></path></g><g transform=\"matrix(.013,0,0,-0.013,12.416,0)\"></path></g><g transform=\"matrix(.0091,0,0,-0.0091,18.409,3.132)\"></path></g><g transform=\"matrix(.013,0,0,-0.013,25.242,0)\"><use xlink:href=\"#g117-34\"></use></g></svg><span></span><span><svg height=\"11.8174pt\" style=\"vertical-align:-3.1815pt\" version=\"1.1\" viewbox=\"36.4551838 -8.6359 15.699 11.8174\" width=\"15.699pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,36.505,0)\"></path></g><g transform=\"matrix(.013,0,0,-0.013,42.745,0)\"><use xlink:href=\"#g113-47\"></use></g><g transform=\"matrix(.013,0,0,-0.013,45.709,0)\"></path></g></svg>)</span></span> and supersonic (<span><svg height=\"11.8174pt\" style=\"vertical-align:-3.1815pt\" version=\"1.1\" viewbox=\"-0.0498162 -8.6359 32.873 11.8174\" width=\"32.873pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,0,0)\"><use xlink:href=\"#g113-78\"></use></g><g transform=\"matrix(.013,0,0,-0.013,12.416,0)\"><use xlink:href=\"#g113-98\"></use></g><g transform=\"matrix(.0091,0,0,-0.0091,18.409,3.132)\"><use xlink:href=\"#g190-103\"></use></g><g transform=\"matrix(.013,0,0,-0.013,25.242,0)\"><use xlink:href=\"#g117-34\"></use></g></svg><span></span><span><svg height=\"11.8174pt\" style=\"vertical-align:-3.1815pt\" version=\"1.1\" viewbox=\"36.4551838 -8.6359 15.699 11.8174\" width=\"15.699pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,36.505,0)\"><use xlink:href=\"#g113-50\"></use></g><g transform=\"matrix(.013,0,0,-0.013,42.745,0)\"><use xlink:href=\"#g113-47\"></use></g><g transform=\"matrix(.013,0,0,-0.013,45.709,0)\"></path></g></svg>)</span></span> flight conditions. It was observed that a high fuel-rich degree in the rocket plume negatively impacts the eject performance under all conditions. However, it improves the overall performance (<span><svg height=\"14.0004pt\" style=\"vertical-align:-5.3645pt\" version=\"1.1\" viewbox=\"-0.0498162 -8.6359 13.4272 14.0004\" width=\"13.4272pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,0,0)\"></path></g><g transform=\"matrix(.0091,0,0,-0.0091,4.719,3.132)\"></path></g><g transform=\"matrix(.0091,0,0,-0.0091,8.013,3.132)\"></path></g></svg>)</span> at high flight Mach numbers (<span><svg height=\"11.8174pt\" style=\"vertical-align:-3.1815pt\" version=\"1.1\" viewbox=\"-0.0498162 -8.6359 21.7785 11.8174\" width=\"21.7785pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,0,0)\"><use xlink:href=\"#g113-78\"></use></g><g transform=\"matrix(.013,0,0,-0.013,12.416,0)\"><use xlink:href=\"#g113-98\"></use></g><g transform=\"matrix(.0091,0,0,-0.0091,18.409,3.132)\"><use xlink:href=\"#g190-103\"></use></g></svg>).</span> For supersonic conditions, increasing the fuel-rich degree promotes greater fuel participation in combustion, thereby enhancing RBCC engine performance. Nevertheless, the subsonic-supersonic mixing layer exhibits low evolution, resulting in a decrease in reaction efficiency from 29.2% to 12.0% as the <svg height=\"8.68572pt\" style=\"vertical-align:-0.0498209pt\" version=\"1.1\" viewbox=\"-0.0498162 -8.6359 9.93839 8.68572\" width=\"9.93839pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,0,0)\"><use xlink:href=\"#g113-150\"></use></g></svg> decreases from 3.2 to 1.6. Consequently, there is an inefficient utilization of fuel. To optimize RBCC engine performance, the rocket fuel-rich degree can be appropriately increased. However, this increase should be limited to prevent fuel wastage arising from low reaction efficiency. Under subsonic conditions (<span><svg height=\"11.8174pt\" style=\"vertical-align:-3.1815pt\" version=\"1.1\" viewbox=\"-0.0498162 -8.6359 32.873 11.8174\" width=\"32.873pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,0,0)\"><use xlink:href=\"#g113-78\"></use></g><g transform=\"matrix(.013,0,0,-0.013,12.416,0)\"><use xlink:href=\"#g113-98\"></use></g><g transform=\"matrix(.0091,0,0,-0.0091,18.409,3.132)\"><use xlink:href=\"#g190-103\"></use></g><g transform=\"matrix(.013,0,0,-0.013,25.242,0)\"><use xlink:href=\"#g117-34\"></use></g></svg><span></span><span><svg height=\"11.8174pt\" style=\"vertical-align:-3.1815pt\" version=\"1.1\" viewbox=\"36.4551838 -8.6359 15.699 11.8174\" width=\"15.699pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,36.505,0)\"><use xlink:href=\"#g113-49\"></use></g><g transform=\"matrix(.013,0,0,-0.013,42.745,0)\"><use xlink:href=\"#g113-47\"></use></g><g transform=\"matrix(.013,0,0,-0.013,45.709,0)\"><use xlink:href=\"#g113-58\"></use></g></svg>),</span></span> the low kinetic energy of captured air leads to the occurrence of “negative thrust surface” and “wall impact” phenomena, which hinder the efficient and stable operation of the RBCC engine. Consequently, adjusting the fuel-rich degree alone cannot promote specific impulse (<span><svg height=\"14.0004pt\" style=\"vertical-align:-5.3645pt\" version=\"1.1\" viewbox=\"-0.0498162 -8.6359 13.4272 14.0004\" width=\"13.4272pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g transform=\"matrix(.013,0,0,-0.013,0,0)\"><use xlink:href=\"#g113-74\"></use></g><g transform=\"matrix(.0091,0,0,-0.0091,4.719,3.132)\"><use xlink:href=\"#g190-116\"></use></g><g transform=\"matrix(.0091,0,0,-0.0091,8.013,3.132)\"><use xlink:href=\"#g190-113\"></use></g></svg>),</span> and a low fuel-rich degree is considered an ideal strategy when combined with adjustable nozzle technology.","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":"184 1","pages":""},"PeriodicalIF":1.1000,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Aerospace Engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1155/2024/4340688","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, AEROSPACE","Score":null,"Total":0}
引用次数: 0
Abstract
The ejector mode of the Rocket-Based Combined-Cycle (RBCC) engine is characterized by high fuel consumption. This study is aimed at investigating the influence of the rocket fuel-rich degree on the RBCC engine’s performance under the ejector mode combined with simultaneous mixing and combustion (SMC). Numerical simulations were conducted for various rocket mixing ratios () under subsonic () and supersonic () flight conditions. It was observed that a high fuel-rich degree in the rocket plume negatively impacts the eject performance under all conditions. However, it improves the overall performance () at high flight Mach numbers (). For supersonic conditions, increasing the fuel-rich degree promotes greater fuel participation in combustion, thereby enhancing RBCC engine performance. Nevertheless, the subsonic-supersonic mixing layer exhibits low evolution, resulting in a decrease in reaction efficiency from 29.2% to 12.0% as the decreases from 3.2 to 1.6. Consequently, there is an inefficient utilization of fuel. To optimize RBCC engine performance, the rocket fuel-rich degree can be appropriately increased. However, this increase should be limited to prevent fuel wastage arising from low reaction efficiency. Under subsonic conditions (), the low kinetic energy of captured air leads to the occurrence of “negative thrust surface” and “wall impact” phenomena, which hinder the efficient and stable operation of the RBCC engine. Consequently, adjusting the fuel-rich degree alone cannot promote specific impulse (), and a low fuel-rich degree is considered an ideal strategy when combined with adjustable nozzle technology.
期刊介绍:
International Journal of Aerospace Engineering aims to serve the international aerospace engineering community through dissemination of scientific knowledge on practical engineering and design methodologies pertaining to aircraft and space vehicles.
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Unmanned air vehicles (UAVs).
Review articles on any of the above topics are also welcome.