in this paper, instantaneous heat transfer rate at different positions on the cylinder head wall of a single cylinder diesel engine is calculated by using one dimensional unsteady heat transfer model based on the temperature pulsation on the cylinder head wall measured by surface thermocouples.

the results of the experiments demonstrated that appropriate high temperature cooling can simulate the ceramic insulation and can reduce the engine fuel consumption.

本文证实，适当的高温冷却能够模拟气缸盖壁面喷涂陶瓷的隔热，并可降低柴油机油耗率。

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the problem of the friction between the piston groups and the cylinder wall was studied and its friction heat model was established.

研究了活塞组与气缸套壁面的摩擦问题，建立了活塞组与气缸套壁面的摩擦产热模型；

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the effects of high temperature cooling on heat transfer and performance of the engine were investigated and analyzed in detail.

在实测气缸盖壁面平均温度、瞬态温度和性能参数的基础上，详细研究和分析了高温冷却对气缸盖壁面传热规律和发动机性能参数的影响。

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in order to make the simulation process better fit the actual process, the refrigerant equations of state and the criteria equations of heat transfer between the gaseous refrigerant and the cylinder wall were introduced while the differential equations of compression and expansion processes were created.

在建立压缩过程和膨胀过程的微分方程式时，引入了制冷工质的状态方程式和工质与气缸壁之间放热的准则方程式，使模拟的过程更接近于实际情况。

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the determination of the transient heat transfer coefficient between working substance and the surface of cylinder in internal combustion engines is an important foundation for studying the practical cycle of the engines and the thermal loadings of their high-temperature parts.

在内燃机中，工质与气缸壁面之间瞬时换热系数的确定，是研究内燃机实际循环及其高温部件热负荷的重要基础。

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it is equipped with piston rings to provide a good seal between the cylinder wall and piston. with the car upside-down, the ball forces the plunger to seat against the guide plate.

上面装有活塞环，从而使活塞和气缸壁之间具有良好的密封性。当汽车倾倒时，滚珠迫使柱塞落在支承板上。

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the coating layer is a telfon coating layer, namely a polytetrafluoroethylene coating layer, the coating layer can reduce frictional force, which leads the cylinder wall to be more wear-resisting.

涂层为特氟龙涂层，即聚四氟乙烯涂层，涂层可以减少摩擦力，使气缸壁更加耐磨。

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from the differences of the vibration acceleration signal power spectrum, the cylinder clearance can be diagnosed, so that whether the engine may be repaired or not can be determined.

根据不同的振动加速度功率谱，可以诊断出气缸壁间隙值以确定柴油机是否需要修理。

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the piston ring is an important part of internal-combustion engine, the tightness between piston ring and cylinder wall has a bearing directly on efficiency of internal-combustion engine.

活塞环是内燃机的重要零件之一，它与气缸壁的密合程度直接决定着发动机的工作效率。

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however, in some small engines, the cylinder walls are plated with chromium, a very hard metal, to reduce wall wear and lengthen their life.

而对于一些小型发动机，气缸壁面镀铬，铬是一种硬度非常高的金属，可减少气缸壁的磨损并延长使用寿命。

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the upper ring or rings are to prevent compression leakage; the lower ring or rings control the amount of oil being deposited on the cylinder wall.

上部的活塞环用来阻止压缩空气泄露；而下部的活塞环用来控制气缸壁上存留下来的机油数量。

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our model considers heat leak between cylinder wall and environment in combustion process, internal irreversibility of cyclic working fluid in adiabatic processes, and cycle time.

模型考虑了燃烧过程气缸壁与环境间的热漏、循环工质在绝热过程中的内不可逆性以及循环时间的影响。

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there are three kinds of abrasion such as adhesive abrasion, abrasive abrasion and corrosive abrasion on interior wall of cylinder in cold starting at low temperature.

发动机低温冷启动时气缸壁的磨损主要有粘着、磨粒、腐蚀磨损等三种形式。

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taking the 2105a model diesel engine as an example, this paper investigates the vibration signal of running engine surface caused by the different cylinder clearance.

本文以2105A型柴油机为例，探讨了柴油机工作状态下气缸壁间隙不同时所引起的机体振动信号。

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in this model, the flame front is supposed to be cylindrical and propagating from the center of the spark plug to the walls;

在模型中，假设火焰前锋面为柱形，它从火花塞中心向气缸壁面传播；

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the top two rings are to keep the gases in the cylinder and are called compression rings.

最顶的两道保证活塞与气缸壁间密封的环叫做气环。

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the anti-scuffing function should be enhanced simultaneously in the design of supercharge and cylinder diameter enlargement.

柴油机的增压与扩缸设计中，同时应当考虑增强气缸壁的抗擦伤能力。

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rings provide the needed seal between the piston and the cylinder walls.

环为活塞和气缸壁之间提供了必要的密封。

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the sealing rings are pressed against the cylinder wall by the differential gas pressure.

通过气压差将密封圈压入气缸壁。

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numerical simulation of heat transfer in cylinder wall of i.c.engines

内燃机气缸壁面传热的数值模拟

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