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  “4-valve”译为未确定词的双语例句
    Study on Lean Mixture Combustion and NO_x Emissions Reduction in A Four-Valves Gasoline Engine
    四气门汽油机稀混合气燃烧及降低NO_x排放的研究
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    Research and Development on Electromechanical Valve Actuation
    电磁驱动气门机构的设计开发和试验研究
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    Study on Nonlinear Dynamics of Valve System of Internal Combustion Engine
    内燃机配气系统的非线性动力学研究
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    The Lean-Mixture Combustion in a CA1102Q Five-Valve S.I.Engine with Electronic-Controlled Port-Fuel-Injection
    CA1102Q五气门汽油机电控燃油喷射稀混合气燃烧的研究
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    Valve Train Dynamic Experiment and Model Study
    配气机构动力学试验方法与模型规划研究
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  -valve
This field was visualised in an optical single-cylinder 4-valve pentroof-type spark-ignition engine by means of laser-sheet illumination in planes parallel to the cylinder head gasket 6 and 10?mm below the spark plug.
      
The study was carried out for a 4-valve engine head with shrouded intake valves in a special single cylinder transient water analog.
      


Based on the experiments of swirl producing induction ports on the "Steady flow testing rigs", the flow patterns inside and outside of the ports are studied, the velocity vectors around the inlet valve periphery are measured. The influences of constructional parameters of various sections along the port on flow characteristics are analysed. The results show that there are two distinct flows inside the swirl producing port and they could be suitably arranged. Finally, a swirl producing inlet port is designed...

Based on the experiments of swirl producing induction ports on the "Steady flow testing rigs", the flow patterns inside and outside of the ports are studied, the velocity vectors around the inlet valve periphery are measured. The influences of constructional parameters of various sections along the port on flow characteristics are analysed. The results show that there are two distinct flows inside the swirl producing port and they could be suitably arranged. Finally, a swirl producing inlet port is designed with reasonable flow coefficient and rather high swirl. The newly designed port will be later tested on an automotive diesel engine model 490Q.

利用在稳定流动试验台上进行气道模型试验的方法,观察了气道内外的气体流 动,测量了气门口气体出流的速度分布:实验分析了气道各部位结构参数对气道性能的 影响,提出了气道内两股气流配合的新看法,最后设计出一种阻力不大而涡流比较高的 新气道,作为进一步提高490Q车用柴油机性能试验的基础。

By means of combustion photograph, it was revealed that one of the causes refered to the appearance of after combustion and higher heat load in the slow and medium speed supercharged diesel engine is due to the distribution of fuel and air in the cylinder being not fited with each other. In order to change the unfavorable condition, it is necessary to take some measures for reducing or eliminating the over rich mixture area around fuel injector under cylinder head. This paper presents the following processes....

By means of combustion photograph, it was revealed that one of the causes refered to the appearance of after combustion and higher heat load in the slow and medium speed supercharged diesel engine is due to the distribution of fuel and air in the cylinder being not fited with each other. In order to change the unfavorable condition, it is necessary to take some measures for reducing or eliminating the over rich mixture area around fuel injector under cylinder head. This paper presents the following processes. (1 ) Increasing the amount of early injection portion before ignition and reducing the total injection duration. By the way of decreasing the under fuel pressure area of injector needle before lifting and raising the opening injection pressure, it is beneficial to reduce the contacting stress while needle valve is closing. And aslo, the maximum combustion pressure and exhaust temperature has been lowered in practice. In the mean time, it gives positive effect to the elimination of after injection and cavitation in the fuel injection system. (2)Crrying out film-atomization combustion system in the direct injection w type combution chamber. This combustion system applied in the supercharged diesel engine presents two particul ar characteristics which are lower maximum combustion pressure and higher air utilization. Combining these two points, it results that the mechanial and heat load and the air consumption of supercharged diesel engine can be lowered.

通过中速机缸内照像,揭示出中低速增压柴油机后燃和热负荷高的根源之一;是由于燃油与空气在缸内分布互不适应。改变这种状况的主攻方向之一,是在于排除缸盖下喷油器外围混合气过浓区。 本文介绍了以下方面的探索: 1.缩短射油持续期;增大初期射油比例。 用降低喷油器承压面积比,提高启喷压力的措施,减小针阀落座的接触应力和降低缸内机械负荷和热负荷,同时,对解决燃油系统中两次喷射和空蚀现象亦有积极作用。 2.在直接喷射式ω型燃烧室中实行油膜-雾化燃烧,具有最大燃烧压力低和燃烧恶化拐点的进气压力低两大特点,这对减轻机器的热负荷与机械负荷,提高比功率,减少耗气量等方面有积极作用。

The article describes the experimental investigations carried out on a lOOOt/h UP boiler operating at subcritical pressure regarding the replacement of the throttle control valves for the distributies of flow in the furnace water walls by throttle orifices. An analysis is given on the role of the throttle orifice in the adjustment of heat deviation and on the method of selecting the pressure drop of the orifice, and concrete examples of two UP boilers in the Wangting Power Plant are cited.

本文介绍1000吨/时亚临界压力UP炉水冷壁流量分配所用节流调节阀改装成节流孔板的试验研究。文中分析了节流孔板调整热偏差的作用及孔板压力降的选取方法。并例举了望亭发电厂的有关试验情况。

 
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