Analysis of Heat Transfer in Particle Velocity Sensor with Three-Wire Configuration

Particle velocity sensor (PVS) plays an important role in determining the type and location of a sound source. In this presentation, the analytical model of heat transfer in the PVS with a three-wire (SHS) configuration is first presented. By comparing with the thermal diffusion, the forced convection exerts a smaller influence on the temperature distribution. Thus, variation in forced convection could induce the formation of a thermal perturbation field, and the overall temperature distribution model of a PVS is made up of a steady temperature field and a thermal perturbation field. With the derived model, the PVS with the SHS configuration has smaller thermal noise and higher signal-to-noise ratio in comparison with a two-wire (SS) configuration under the same conditions. Optimized parameters of structural design and heating power can be obtained via the presented analytical model. Also, this model presents optimal output performance and frequency-dependent characteristic curve. Numerical results are found to be in good agreement with the analytical solutions and experimental data, which verifies the correctness of analytical model and the numerical method. The study provides a basis for a theoretical and numerical analysis for the PVS in SHS configuration.