The Performance Study Of The Basic Meter On The V-type Ultrasonic Heat Meters And Vortex Generators

With the2010heat metering work in full swing, all over the country new and existing residential buildings, heat metering, with the attendant led gradually to carry out heat metering industry thriving. However, the accuracy has become a major factor in restricting heat metering. According to the principle of transit-time measurement, the ultrasonic signal acquisition is the most important factors affecting the accuracy. In the rectangular pipe, rusting has a bad influence on the reflection and acquisition of the signal, especially in the contact surfaces, which include the ultrasonic transducer and water, and the reflection area of the ultrasonic signal. In addition, small particles or bubbles in the pipeline will also affect the signal transduction. In order to eliminate the negative factors above, this design introduces a device of the vortex generators. It can make the flow field generate whirlpool in the ultrasonic reflection area, to sour the wall and eliminate the tiny particles or bubbles of the reflection region.On the basis of the structure of a V-shaped ultrasonic heat meter which has entered the market, this paper accomplish research and innovation. According to the research results, this paper gives two base tables’structure, containing rectangle and arch, and introduce the vortex generator to enhance the performance of the heat meter. Further this paper clarifies that the vortex generator installation position and tilt angle affect the swirl intensity of the reflection region. Simulation are carried out using the standardκ－ε model and RNGκ－ε model to the V-type ultrasonic heat meter base table, and then compared with the experimental values. Comparison between experiment and simulation showed that standard κ-ε model can meet the requirems.In accordance with the whirl intensity of the reflection region, this paper simulate that how the development of the whirl in the pipe by changing the working conditions. For example, the working conditions include rectangular pipe, circular pipe, the installation location of the vortex generator, and the tilt angle of vortex generator. Based on the results of this calculation and analysis, the best installation location and best tilt angle of the vortex generator are found. To deal with the calculation results, two kinds of programs are designed to reflect the influence of different parameters of the vortex generator on the whirlpool, for example, the use of particle angular velocity in the flow field and the Stokes’theorem.In this paper, the method of numerical simulation combined with theoretical analysis, is supported by the experiments to verify the correctness of the numerical simulation method. The methods of this paper are right and vivid which assisted by a lot of figures about inner flow. The research of this paper on the V-type ultrasonic heat meter provides the related base and direction for the design of the basic meter. It has made up for the vacancy of domestic field and it has some innovation in the inner flow field.