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首页> 外文学位 >A two dimensional model for spray formation and evaporation in a HSDI diesel engine.
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A two dimensional model for spray formation and evaporation in a HSDI diesel engine.

机译：HSDI柴油机中喷雾形成和蒸发的二维模型。

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Compression ignited diesel engines have been widely used in heavy-duty vehicles and are increasingly been used in light duty vehicles. In diesel engines power is generated by injecting the high pressure fuel into the compressed air in the cylinder near top dead center (TDC). For design considerations and engine out emissions prospective it is important to determine the effect of different operating parameters on spray penetration, evaporation and wall impingement.;A two dimensional model was developed to understand the physical processes encountered by the liquid fuel when it is injected into a high pressure and high temperature environment in a diesel engine by decoupling it from the chemical process. The model was also used to understand the differences in the rate of evaporation at different injection pressures. Effort was also made to model the real properties of gases and liquids during the evaporation process which is an important aspect, often neglected in many studies.;The results indicate that the vaporization rate increases with an increase in the injection pressure from 600 bar to 1200 bar at 1500 rpm and 3 bar IMEP. The temperature rise experienced by the droplets during vaporization is more uniform at the higher injection pressures. The time required for the bulk of the fuel to reach its critical temperature is lower at the higher injection pressures. Also the amount of fuel impingement on the combustion chamber wall increases with an increase in the injection pressure and fuel viscosity.
机译：压缩点火柴油机已广泛用于重型车辆，并且越来越多地用于轻型车辆。在柴油发动机中，通过将高压燃料注入到上死点（TDC）附近的气缸中的压缩空气中来产生动力。出于设计考虑和预期的发动机熄火排放，确定不同的运行参数对喷雾渗透，蒸发和壁撞击的影响非常重要。开发了一个二维模型来了解液体燃料在注入时遇到的物理过程通过将柴油机从化学过程中分离出来，在柴油机中提供高压和高温环境。该模型还用于了解在不同注射压力下蒸发速率的差异。还努力对蒸发过程中气体和液体的真实特性进行建模，这是一个重要的方面，在许多研究中经常被忽略;结果表明，随着注入压力从600 bar增加到1200，蒸发速率会增加1500 rpm和3 bar IMEP。在较高的注射压力下，液滴在汽化过程中经历的温度上升更加均匀。在较高的喷射压力下，大部分燃料达到临界温度所需的时间较短。而且，随着喷射压力和燃料粘度的增加，撞击在燃烧室壁上的燃料量也增加。

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