黄蓉，王谦，柏金，禹莉莉，赵岩，吴里程.泄漏间隙对微自由活塞动力装置做功能力的影响[J].内燃机工程,2018,39(3):72-80.
泄漏间隙对微自由活塞动力装置做功能力的影响
Effect of Leakage Gap on Work Capacity of Micro Free Piston Engine
DOI：10.13949/j.cnki.nrjgc.2018.03.011
关键词:微自由活塞动力装置  泄漏间隙  做功  尺度设计
Key Words:micro FPE power device  leakage gap  work capacity  scale design
基金项目:国家自然科学基金项目（51476071）；江苏大学高级人才科研启动基金项目（14JDG146)
作者单位
黄蓉，王谦，柏金，禹莉莉，赵岩，吴里程 江苏大学 能源与动力工程学院，镇江 212013 
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摘要:基于微自由活塞动力装置（micro-free piston engine, Micro-FPE）的单次压燃过程，建立考虑自由活塞与燃烧室壁面泄漏间隙的物理数值模型；比较试验与模拟结果，验证泄漏间隙模型的正确性。在此基础上通过数值计算，研究分析泄漏间隙对Micro-FPE做功能力的影响。数值模拟结果表明：与无泄漏间隙比较，合适的泄漏间隙能够提升Micro-FPE的做功能力；存在某一个特定的泄漏间隙能使Micro-FPE的做功达到最大值。针对输出功率为100W的Micro-FPE直径3mm的微小燃烧室，在文中的计算条件下，当径向间隙为2 μm时，Micro-FPE的指示功高于无泄漏间隙情况；但当径向间隙进一步增加，Micro-FPE燃烧压力升高率减小，做功能力下降；存在临界径向间隙δcrit，大于该临界径向间隙值时Micro-FPE无法着火燃烧及对外做功。
Abstract:Based on the research of the single compression ignition process of a micro free piston engine(Micro-FPE), a physical numerical model considering the leakage gap between the free piston and combustion chamber wall was established, and the correctness of the leakage gap model was verified through the comparative test and simulation calculation. On this basis, the effect of the leakage gap on the work ability of a Micro-FPE was analyzed though numerical calculation. Results show that: compared with no leakage gap, an appropriate leakage gap can improve the work ability of the Micro-FPE, and reach the maximum value at a specific gap. For the Micro-FPE a power of 100 W and the combustion chamber diameter of 3 mm. The indicated work of the engine is higher than that without leakage gap when the radial gap is 2 μm. But with the further increase of radial gap, the combustion pressure rise rate is reduced, leading to the decline of work ability. At last, the Micro-FPE will not be able to burn well and do work normally when the radial clearance is greater than a certain critical value. The conclusion of this study has an important guiding significance for improving the design accuracy of Micro-FPE.
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