| Modeling, Simulation, Analysis, and Decision |
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| Design and simulation of triangular air-powered rotary enginebased on CFD and ADAMS |
| ZHONG Gong-xiang, ZOU Di, ZHANG Xing |
| Key Laboratory of Oil & Gas Equipment， Ministry of Education Southwest Petroleum University， Chengdu 610500， China |
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Abstract In view of the phenomenon that the pressure energy of natural gas is wasted in the process of using the downhole throttling technology in the high pressure gas well, an idea of using triangular air-powered rotary engine to transform natural gas pressure energy to mechanical energy which drives the generator was put forward. Based on the structural features of traditional Wankel-type rotary engines, the overall structural design of a new triangular air-powered rotary engine was carried out and a new decompression scheme was set up. The internal flow field of air motor was simulated numerically by using CFD numerical simulation methods. The kinematics and dynamics simulation of mechanical system of triangular air-powered rotary engine was carried out by using ADAMS software, the contact strength between radial seal and cylinder was checked by Hertz contact theory, and the pressure endurance of cylinder was checked by using ABAQUS. Depending on the simulation data, the correctness of the design of the first stage rotary engine was verified and the design of the secondary rotary engine was defective. After raising the inlet temperature of the second stage rotary engine from 343 K to 353 K, the problem of hydrate generation when pressure and temperature dropped in cylinder was solved. The simulation results provide a new idea for the further study of triangular air-powered rotary engine.
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Received: 11 May 2018
Published: 28 June 2019
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基于CFD与ADAMS的三角转子气动机设计与仿真
针对采用高压天然气井井下节流降压工艺时存在浪费天然气压力能的现象，提出了利用三角转子气动机将高压天然气压力能转化为机械能驱动发电机发电的思路。首先，借鉴传统三角转子发动机结构特点，对三角转子气动机进行了总体结构设计并提出全新的降压方案；然后，利用CFD （computational fluid dynamics，计算流体动力学）数值模拟方法对气动机内部流场进行了数值模拟；最后，利用ADAMS(automatic dynamic analysis of mechanical systems，机械系统动力学自动分析)软件对三角转子气动机机械系统进行了运动学与动力学仿真，运用赫兹接触理论校核了径向密封片与气缸的接触强度，利用ABAQUS分析软件校核了缸体耐压强度。仿真结果表明，第1级气动机设计合理，第2级气动机的设计存在缺陷，将第2级气动机入口温度从343 K提高到353 K后，解决了气缸中因压力、温度下降产生水合物的问题。仿真结果为后续三角转子气动机的深入研究提供了新思路。
关键词：
CFD,
三角转子气动机,
动网格,
数值模拟
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