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在研究内燃机的过渡过程时,必须知道通过发动机的空气流量的瞬时值,而为此,要首先能测量非稳定流的瞬时流量。所以,必须深入研究并提出非稳定流流量的测量方法。目前,测量空气或气体流量最常用的设备是收缩装置(隔板、喷咀、流量管)或者测压管。但它们仅适用于测量稳定流的流量,而且有以下缺点:在导管中产生了附加阻力;在收缩装置前后的直线导管部分要有很大的长度。上述缺点,在大功率发动机研究中已成为
When studying the internal combustion engine transition process, it is necessary to know the instantaneous value of the air flow through the engine, and for this purpose, the transient flow of the unsteady flow should first be measured. Therefore, we must study and put forward in-depth measurement of unsteady flow. Currently, the most commonly used devices for measuring air or gas flow are shrinking devices (diaphragms, nozzles, flow tubes) or piezometers. However, they are only suitable for measuring the flow rate of a steady flow and have the following disadvantages: additional resistance is created in the catheter; the length of the straight catheter part before and after the contraction device is large. The above shortcomings, in high-power engine research has become