Modified verison design method of axisymmetric unmixed-flow nozzle to mixed-flow nozzle

被引：0
|
作者：
Wang Y. [1 ]
Ji H. [1 ]
Chen B. [2 ]
Li J. [2 ]
机构：
[1] College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
[2] Beijing Power Machinery Research Institute, China Aerospace Science and Industry Corporation, Beijing
来源：
Hangkong Dongli Xuebao/Journal of Aerospace Power | 2017年 / 32卷 / 07期
关键词：
Increased gross thrust; Infrared radiation; Mixed-flow nozzle; Modified version design; Turbofan engine; Unmixed-flow nozzle;
D O I：
10.13224/j.cnki.jasp.2017.07.015
中图分类号：
学科分类号：
摘要：
In order to achieve the increased gross thrust and different spatial distributions of infrared radiation (IR) characteristics, a modified version design method of axisymmetric unmixed-flow nozzle based on CFD numerical simulation was established to change it into mixed-flow nozzle. Results indicated that: (1) An estimating method of nozzle thrust was proposed when the core and fan flow were mixed at various degrees, the error between the estimated value and the true one was basically less than 0.005 in the parameter scope. (2) Influence on modified version design of the core and fan flow condition was analyzed, increased thrust may be achieved when the total-pressure ratio of fan flow to core flow was between 0.8 and 1.5, and the mixing degree should be larger than 0.1. (3) Increased gross thrust was achieved after the modified version design, the thrust coefficient of mixed-flow nozzles with confluent mixer increased by 0.0087-0.0126 in comparison with the unmixed-flow nozzle; when lobed mixer was adopted, the thrust coefficient increased by 0.0289. (4) The integral IR intensity of mixed-flow nozzle increased in the azimuth angles of 0°-15°, but it significantly decreased in all the other azimuth angles, the largest decline was 77.5%. © 2017, Editorial Department of Journal of Aerospace Power. All right reserved.
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页码：1648 / 1657
页数：9
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