CAJ | 학술논문

为了改进16V240ZJB型柴油机性能，借助模拟计算与气道稳流试验相结合的方法，首先利用三维造型软件UG对气道进行实体建模，然后利用气道稳流试验数据为模拟计算提供边界条件，以AVL—FIRE软件为平台，采用合适的湍流模型和计算方法对气道内的三维流场进行数值模拟，得到了不同气门升程下详细的流场信息。气道性能评价参数（流量系数和涡流比）的计算结果与稳流试验台的试验结果吻合较好，验证了应用数值模拟方法评价气道的可行性；通过流场分析，找到了气道不合理的部位，提出了气道改进措施，并再次进行了数值模拟计算。计算结果表明，改进后的气道结构在大升程下进气流量得到明显提高，进气流动状态也得到了很好的改善。
위료개진16V240ZJB형시유궤성능，차조모의계산여기도은류시험상결합적방법，수선이용삼유조형연건UG대기도진행실체건모，연후이용기도은류시험수거위모의계산제공변계조건，이AVL—FIRE연건위평태，채용합괄적단류모형화계산방법대기도내적삼유류장진행수치모의，득도료불동기문승정하상세적류장신식。기도성능평개삼수（류량계수화와류비）적계산결과여은류시험태적시험결과문합교호，험증료응용수치모의방법평개기도적가행성；통과류장분석，조도료기도불합리적부위，제출료기도개진조시，병재차진행료수치모의계산。계산결과표명，개진후적기도결구재대승정하진기류량득도명현제고，진기류동상태야득도료흔호적개선。
By integrating numerical simulation and steady flow testing of the intake port, e. g. , a solid modeling of the intake port with 3 - D modeling software （UG） and the boundary conditions for simulation generated by steady flow test data, the flow fields under different valve lifts are obtained with the help of AVL - FIRE software which implements numerical simulation of 3 -D flow fields in the intake port by utilizing proper turbulence models and computing methods. The calculation of the performance evaluation parameters （flow coefficient and turbulence ratio） of the intake port coincides well with the test results of steady flow, which verifies the feasibility of assessing intake port with numerical simulation. With the aid of flow field analysis, improper positions in the intake port are pinpointed and improvement approaches to the port are proposed, following a numerical simulation once again. Calculation indicates that the inlet flow of the modified intake port structure is greatly increased and the inlet flow condition is consequently improved, which will surely contribute to the performance enhancement of 16V240ZJB diesel engine.