| 董翔宇,汪洋,徐帅卿,等.二冲程液压自由活塞发动机半直接喷射的仿真研究[J].内燃机工程,2021,42(3):8-15. |
| 二冲程液压自由活塞发动机半直接喷射的仿真研究 |
| Simulation of Semi Direct Injection of Two-Stroke Hydraulic Free Piston Engine |
| DOI：10.13949/j.cnki.nrjgc.2021.03.002 |
| 关键词:液压自由活塞发动机 二冲程 半直接喷射 混合气生成 |
| Key Words:hydraulic free piston engine two-stroke semi direct injection mixture formation |
| 基金项目:国家自然科学基金项目（51476113, 51776135, 51406135） |
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| 摘要:利用CONVERGE软件建立了半直喷式液压自由活塞发动机的三维计算流体动力学(computational fluid dynamics, CFD)仿真模型，研究了喷射角度、喷油定时、缸头倾角、进气压力对燃料捕获和混合气生成的影响。结果表明：随喷射时刻的推迟，燃料捕获率增加，蒸发时间变长；喷射角度越大，燃料捕获率越高，蒸发时间随喷射角度增加先减小后增大；合理的喷射角度和喷油定时下，燃料捕获率能达到99%以上；缸头倾角对燃料捕获影响不大，较大的缸头倾角下，燃料蒸发速度更快，缸内燃料分布更为均匀；随进气压力的提高，燃料捕获率下降，蒸发时间减小，与改变喷油参数相比，在相同的燃料捕获率下，改变进气压力得到的混合气更加均匀，混合气不均匀度最低达到0.5。 |
| Abstract:A three-dimensional computational fluid dynamics (CFD) simulation model of two-stroke semi-direct injection hydraulic free-piston engine (HFPE) was built by the CONVERGE. The effects of the injection angle, fuel injection timing, chamfer of cylinder head, intake pressure on fuel capture and mixture generation were studied，the results show that as the injection time is delayed, the fuel capture rate and evaporation time increase. As the injection angle increase, the fuel capture rate raise, the evaporation time decreases first and then increases as the injection angle increases. With the appropriate injection angle and injection timing, the fuel capture rate can reach more than 99%. The chamfer of cylinder head has little effect on fuel capture, under the larger cylinder head, the fuel evaporates faster and the fuel distribution in the cylinder is more uniform. As the intake pressure increase, the fuel capture rate and the evaporation time decrease. Compared with changing the fuel injection param-eters, under the same fuel capture rate, the mixture obtained by changing the intake pressure is more uniform, the minimum mixed gas unevenness can reach 0.5. |
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