Research on Verabar Flow Meter Used to Measure Engine Exhaust Flow

Abstract: The research information of the Verabar flow meter used to measure the exhaust flow of the engine is provided by the excellent flow meter and flow meter production and quotation manufacturers. As a flow rate measuring device, the engine Verabar flowmeter for measuring displacement is of its own design, eg from structural features. Due to the special structure of the design of the flowmeter, in fact it shows that it has other advantages such as reliability accuracy, excellent pressure. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the research articles that Verabar flowmeters are used to measure engine exhaust flow. As a flow rate measuring device, the engine Verabar flowmeter for measuring displacement is of its own design, eg from structural features. Due to the special structure of the design of the flowmeter, it actually shows that it has other advantages such as reliability accuracy, excellent pressure, temperature, and corrosion. Measuring engine performance, emissions, is one of the main parameters that requires measuring exhaust flow. However, directly measuring the flow of exhaust gas is a relatively difficult characteristic of engine exhaust gas. Displacement to reflect, as well as fuel consumption under normal conditions, but the amount of air flow, strictly speaking, the measured exhaust gas does not take into account the amount of engine leakage, therefore, you may not be accurate. Since the displacement must be measured directly, in general, supercharged engines are continuously measured in specific studies, exhaust gas recirculation, and dilution of the exhaust gas emitted by the engine, we use an exhaust gas flowmeter. It may be at idle temperature, first of all, the exhaust temperature of the engine, the temperature difference between the exhaust and the exhaust, can be higher than 800 ℃, the maximum temperature at full load (full speed): the flow rate of the engine exhaust Measurement, the following problem is directly, 150 ℃, need to take into account, the exhaust resistance increases, because the fuel consumption rate of the engine increases, because the increase in the exhaust gas supply, the power engine pushes Next, measuring the displacement of the engine it is not possible to generate Too much, the third resistance, it can be the corrosion of the flow meter There are particulate matter substances and strong acids, such as the exhaust gas of the engine, and the gas temperature in the exhaust gas increases, worsening the emission measurement displacement adding meaningless holes may cause clogging of the Mima Nor flow cytometer or flowmeter, change the state of the exhaust gas of the engine, and due to the discontinuity in the exhaust gas of the engine, in particular, the exhaust pulsation caused by the exhaust pressure before is large, in particular, there is a Exhaust turbochargers and unsupercharged engines. The flowmeter (Werabar) designed in this paper to measure the power bar design is a new, quantitative measure of the accuracy of the exhaust flow. The single Verabar flowmeter is based on the principle of differential pressure. When fluid flows through the sensor, the front (facing in the direction of flow), which reads with the Verabar flowmeter sensor, the rear exhaust pipe to generate a high voltage sensor distribution of low set pressure by the distribution of the high pressure area At regularly arranged multiple specific (usually 3 double) high, measurement ends facing the fluid pressure in the direction of flow, each fluid pressure to a pressure tap for each point is generated (including known as velocity pressure and static pressure The average value of pressure may be dynamic pressure) P1 pressure value has been measured at the point. The static pressure measurement is averaged over multiple points of the fluid, and the most important holes are in the low pressure region of the pickup (downstream direction), i.e. the sidewall of the lower pressure value P2. P2 is the pressure difference of ΔP= P1-P2 and P1, which is introduced into the differential pressure transmitter, the average speed, that is, the average flow rate of the pressure reflected by the analysis temperature on the metrological verification principle of the fuel dispenser, ΔP can be estimated the flow rate of the fluid. Flow sensors are produced from stainless steel, a corrosion-resistant metal that has a special cross-sectional shape, as shown in Figure 2. Just Verabar. The separation point of the fluid at the low pressure port and the probe, before the high pressure port, is located on the lateral sides of the probe in front of the probe. The metal surface in front of the probe is roughened. According to the principle of aerodynamics, the fluid at low speed allows the probe to get a stable flow of fluid through the rough surface, forming a turbulent boundary layer that is stable, which is conducive to improving the measurement accuracy at low speeds and thus in the middle The proportion of increasing, accurate differential pressure signal. The Verabar flow sensor design is such a major attempt to prevent impact. However, if in a hydrostatic pipeline, the operation of the fluid flow sensor starts to enter the high pressure probe of the hollow hole, a pressure equilibrium state is formed immediately, after which he has formed a pressure equilibrium state for a long time and the high pressure port shunting The vortices formed on both sides of the involute leaving towards the back of the probe head have no input, the detour at the inlet of the high pressure fluid is detected. Under normal circumstances, the particulate impurities are concentrated in the lower part of the rear side under the action of the probe part, pulling the vortex. To avoid swirls at low pressure ports,To achieve the nature of the land, due to the separation point of the wake-up fluid port and low pressure on both sides of the probe front, etc., as to avoid the accumulation of impurities in the region, the change of the current generated signal.

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