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首页> 外文会议>ASME Internal Combustion Engine Division Technical Conference >AN EXPERIMENTAL STUDY OF SPARK ANEMOMETRY FOR IN-CYLINDER VELOCITY MEASUREMENTS
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AN EXPERIMENTAL STUDY OF SPARK ANEMOMETRY FOR IN-CYLINDER VELOCITY MEASUREMENTS

机译：缸内速度测量火花风速测量的实验研究

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It has been demonstrated by previous researchers that an approximate value of the bulk flow velocity through the spark plug gap of a running spark ignition engine may be deduced from the voltage and current waveforms of the spark. The technique has become known as spark anemometry and offers a robust means of velocity sensing for engine combustion chambers and other high temperature environments. This paper describes an experimental study aimed at improving performance of spark anemometry as an engine research tool. Bench tests were conducted using flow provided by a calibrated nozzle apparatus discharging to atmospheric pressure. Whereas earlier studies had relied upon assumptions about the shape of the stretching spark channel to relate the spark voltage to the flow velocity, the actual spark channel shape was documented using high speed video in the present study. A programmable ignition system was used to generate well-controlled constant current discharges. The spark anemometry apparatus was then tested in a light duty automotive engine. Results from the image analysis of the spark channel shape undertaken in the present study have shown that the spark kernel moves at a velocity of less than that of the free stream gas velocity. A lower velocity threshold exists below which there is no response from the spark. It is possible to obtain a consistent, nearly linear relationship between the first derivative of the sustaining voltage of a constant current spark and the free stream velocity if the velocity falls within certain limits. The engine tests revealed a great deal of cycle-to-cycle variation in the in-cylinder velocity measurements. Instances where the spark restrikes occur during the cycle must also be recognized in order to avoid false velocity indications.
机译：以前的研究人员已经证明，可以从火花的电压和电流波形推导出通过运行火花点火发动机的火花塞间隙的散装流速的近似值。该技术已被称为Spark Dequomicry，为发动机燃烧室和其他高温环境提供一种稳健的速度感测。本文介绍了一种实验研究，旨在提高Spark Desemometry作为发动机研究工具的性能。使用由校准的喷嘴装置提供的流量排出到大气压力的流动进行台式测试。然而，早期的研究依赖于围绕拉伸火花通道的形状的假设，以使火花电压与流速相关的火花电压，在本研究中使用高速视频记录了实际火花通道形状。可编程点火系统用于产生良好控制的恒定电流放电。然后在轻型汽车发动机中测试火花风光仪装置。本研究中进行的火花通道形状的图像分析结果表明，火花仁以小于自由流气体速度的速度移动。下面存在较低的速度阈值，其中没有来自火花的响应。如果速度落在一定限度内，则可以获得恒定电流火花的维持电压的第一导数与自由流速度之间的一致性，几乎线性的关系。发动机测试揭示了缸内速度测量中的循环到循环变化很大。还必须识别出现在循环期间出现的火花重型的情况，以避免假速度指示。

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