关于柴油机EGR的英文翻译，有几个单词不确定，悬赏求解答。
- 英文原文：On the other hand, a compressor of a turbocharger is driven by an exhaust turbine. A compressor impeller converts the power output from the turbine to kinetic energy of air. After that a diffuser and a compressor 【scroll】 convert this kinetic energy to pressure by gradually decreasing velocity of air flow. Figure 3 shows an example of variation of static pressure at the diffuser under steady state flow on turbocharger test rig. The static pressures were measured at diameter ratio 1.2 to the compressor impeller. The pressure ratio between at the diffuser and the 【scroll outlet】 changes by operating points. At near 【choke condition】, the pressure ratio is higher than at compressor peak efficiency and near pre-surge conditions. Also the pressure ratio shows a tendency to decrease at higher speed. Usually compressor choke region is not used, therefore the pressure ratio is about from 0.9 to 0.8. 我的译文：另一方面，涡轮增压器的压缩机受排气涡轮驱动。压缩机叶轮改变了涡轮的气体动能输出。然后，扩压器和压缩机**逐渐降低气流速度将动能转变为压力。如图3所示涡轮增压器测试装置中静压力在扩压器稳流里的变化。这种静压力在1.2倍压缩机叶轮直径范围内是有规律的。扩压器和**之间的压缩比被操作点所改变。在靠近的**，压缩比高于压缩机最高功率和接近临喘振状态。同样，压缩比显示了一种降低更高速度的趋势。通常压缩机的阻塞区域是用不到的，因此压缩比大概在0.9到0.8之间。 ================================================================= 不知道如何翻译的部分我用括号括出来了，在中文部分用**代替，请大大帮看一下。 另外有一些翻译得似乎不准确的地方，请提供修改意见，多谢了。 Figure 3 shows an example of variation of static pressure at the diffuser under steady state flow on turbocharger test rig.我翻译成“如图3所示涡轮增压器测试装置中静压力在扩压器稳流里的变化。” operating points我翻译成“操作点” pre-surge conditions我翻译成“临喘振状态”（似乎应该是“临暴震状态”？） choke region我翻译成“阻塞区” 谁帮我解决这些问题，20悬赏分就归你啦。
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提问者：网友
2017-03-22
