Question

汽车专业英语帮忙翻译！！急急

Work has been carried out involving development of an
LPG DI diesel engine, utilizing two cetane enhancing
additives: Di-tertiary-butyl peroxide (DTBP) and 2-Ethylhexylnitrate (2EHN)) and a base LPG fuel. Engine performance
and emission characteristics were measured using a single cylinder DI diesel engine. The results of this work can be summarized as follows:1. Compared to light diesel fuel, LPG has higher compressibility and lower viscosity. Thus, the injection timing needs to be advanced, since the onset of actual injection is delayed by about 7° CAD in this work.
2. The cetane number of LPG is so low that normal diesel engine operation on LPG alone is not possible.Increasing the concentration of cetane number improvers resulted in shorter ignition delays, and lower cyclic variation. When more than either 5 wt %DTBP or 3.5 wt % 2EHN was added to the 100% butane base fuel, stable engine operation over a wide range of engine loads (BMEP of 0.03 to 0.60 MPa)
was possible.
3. The thermal efficiency with cetane enhanced LPG fuel was comparable to conventional diesel operation,when the concentration of DTBP exceeded 5wt%. Also, exhaust emissions showed that NOx and the smoke emissions could be significantly reduced using the DTBP doped LPG fuel, compared to a light diesel fuel at the same experimental conditions .
4. Correlations among ignition delay, BMEP and either DTBP concentration or the cetane number were made. It was found that the effect of BMEP on ignition delay was not significant. A cetane number of about 53, comparable to commercially available diesel fuel, was possible when 15 wt% of DTBP was added to the butane base fuel.
5. When propane was added to the butane base fuel,the ignition delay increased. Thus, if propane is used for a compression ignition fuel, more cetane enhancing
additive is necessary than that required for 100% butane.
6. A simple thermodynamic model, using the detailed reaction mechanism of butane and DTBP, was developed to calculate ignition delay as a function of overall equivalence ratio (or BMEP). The calculated ignition delay compared well with measurements for relatively short ignition delay times (i.e. at higher BMEPs and DTBP concentrations).
7. The calculated ignition delay showed that an increased heat release at relatively high pressure and low temperature conditions enhances butane +DTBP oxidation.
不要在线翻译的。。。。

Answer 1

开展了涉及发展的一个
液化石油气直喷式柴油机，利用两个十六烷值提高
添加剂：涤叔丁过氧化物（ DTBP ）和2 - Ethylhexylnitrate （ 2EHN ） ）和一个基地石油气燃料。发动机性能
和排放特性测量采用单缸直喷式柴油机。这项工作的成果可以归纳如下： 1 。相比，轻柴油，液化石油气具有较高的压缩率和更低的粘度。因此，注射时间需要先进的，因为发病的实际注入被推迟了大约7 ° CAD在这方面的工作。
2 。该十六烷值石油气是如此之低，柴油发动机正常运作石油气本身possible.Increasing浓度的十六烷值改进剂导致较短的点火延迟，并降低周期变化。当超过或者5野生％ DTBP或3.5 ％ 2EHN重量增加了100 ％丁烷基燃料，发动机运行稳定，广泛的引擎负荷（ BMEP 0.03至0.60兆帕）
是可能的。
3 。热效率与十六烷值提高石油气燃料相比传统柴油行动中，当浓度DTBP超过5wt ％ 。此外，废气排放表明，氮氧化物及黑烟排放量可以大大减少使用DTBP掺杂石油气燃料，而轻柴油在同一实验条件。
4 。之间的关系，点火延迟， BMEP ，或者DTBP浓度或十六烷值发了言。结果发现，影响点火延迟BMEP上不显着。阿十六烷值约53相比，商用柴油，有可能在15 ％的野生DTBP添加到丁烷基燃料。
5 。当丙烷添加到丁烷基燃料，点火延迟增加。因此，如果丙烷是用于压燃式燃油，更十六烷值提高
添加剂是必要的比所需要的100 ％丁烷。
6 。一个简单的热力学模型，使用的详细反应机理的丁烷和DTBP ，是计算点火延迟作为一个功能整体量比（或BMEP ） 。点火延迟的计算与比较，以及相对较短的测量点火延迟时间（即在较高BMEPs和DTBP浓度） 。
7 。点火延迟的计算表明，增加热释放在相对较高的压力和低温条件下提高丁烷+ DTBP氧化。