基于数值仿真的水下活塞机动力系统建模  

Model Building of Underwater Piston Engine Dynamical System on Numerical Study

作　　者：刘帅忱 李代金[1] 秦侃[1] 党建军[1] LIU Shuaichen;LI Daijin;QIN Kan;DANG Jianjun(School of Marine Science and Technology,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《空军工程大学学报》2022年第6期42-48,共7页Journal of Air Force Engineering University

基　　金：国家自然科学基金(51909218,51805435)。

摘　　要：水下活塞机动力系统模型以往需要试验才能得到。基于数值仿真方法研究活塞机做功过程,考虑过膨胀现象对活塞机输出性能的影响,建立活塞机指示功计算公式。由指示功拟合公式推出活塞机输出转矩,减去系统辅机消耗的力矩,结合完全气体状态方程得到水下活塞机动力系统模型。根据该模型设计仿真程序和半物理仿真实验对比。数学模型的仿真结果与半物理仿真试验结果相对最大误差为5.28%。研究结果表明,采用数值仿真和理论推导相结合得到的水下活塞机动力系统模型可以代替试验用于水下动力系统特性研究的初步验证。In the past,the model of undersea piston engine system can only be obtained by experiment.And based on the power process of piston machine studied by numerical simulation method and in consideration of the influence of overexpansion on the output performance of piston engine,a fitting formula of indicated work is established.Through the output torque of the piston machine derived by the indicated work fitting formula to subtract the torque consumed by the auxiliary machine in combination with the complete gas equation of state,a dynamic system model of the undersea piston engine is obtained.In comparison the designed simulation program by the model with the semi-physical simulation experiment,the maximum error between the simulation results of the mathematical model and the semi-physical simulation experiment results is 5.28%.The results show that the model of the undersea piston power system based on the combination of numerical study and theoretical derivation can be used for the preliminary verification of the undersea power system characteristics instead of the experiment.

关 键 词：水下活塞机 数值仿真 动力系统模型 过膨胀 

分 类 号：TJ6[兵器科学与技术—武器系统与运用工程]