GUO Qing-lin 1 ， PENG Chang-xin 1 ， WANG Ling-yi 2 ， CAO Jun 1 ， LU Jie 3 ， ZHENG Long-xi 3.The Effect of Bend Section Radius on the Initiation Characteristics of a Reverse Flow Pulse DetonationCombustion Chamber[J].航空发动机,2025,51(1):53-58
The Effect of Bend Section Radius on the Initiation Characteristics of a Reverse Flow Pulse DetonationCombustion Chamber
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Key Words:detonation  pulse detonation turboshaft engine  reverse flow pulse detonation combustion chamber  radius of bend sec⁃ tion  initiation characteristics
Author NameAffiliation
GUO Qing-lin 1 ， PENG Chang-xin 1 ， WANG Ling-yi 2 ， CAO Jun 1 ， LU Jie 3 ， ZHENG Long-xi 3 1. AECC Hunan Aviation Powerplant Research Institute， Zhuzhou Hunan 412002， China； 2. Institute of Engineering Thermophysics， Chinese Academy of Sciences， Beijing 100190， China； 3. School of Power and Energy， Northwestern Polytechnical University， Xi’an 710072， China 
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Abstract:The numerical simulation model and the corresponding experimental system were established for the study of the initiation characteristics of a reverse flow pulse detonation combustion chamber applied to a pulse detonation turboshaft engine, the model was experimentally verified, simulation calculations were conducted using the verified model, the influence of the different bend section radii on the generation of the detonation wave was analyzed under the same inlet and outlet boundary parameters and ignition frequency condition. The results show that there exists a better range of bend section radius (0.9-1.3 times of the pipe diameter), which allows the formation of a fully developed detonation wave in the combustion chamber within the limited size range. The high temperature zone and high pressure zone would separate and the local high temperature and high pressure centers would not be formed when the bend section radius was too small. The reflection and convergence effects of the compression waves in the bend section would decrease and the effective high-pressure zones in the bend section are difficult to form when the bend section radius is too large. With the increase of the bend section radius, the distance between the exit of the bend section and the formation position of the detonation wave decreases first and then increases. The total deflagration-to-detonation transition distance of the combustion chamber increases with the increase of the bend section radius.
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