Air-liquid two-phase flow is a common flow pattern in industrial area. The relative velocity between the gas phase and the liquid phase in air-liquid two-phase flow should be considered for the two-phase flow. Technically, it is more challenging to study the instability of bubbles than regular and s...

A fast and accurate gas concentration measurement method by fitting the main peak of the absorption spectrum harmonic signal is proposed for the first time to significantly improve the speed and accuracy of gas concentration measurement by laser wavelength modulation spectroscopy (WMS). In the propo...

The accurate measurement of particle size distribution and optical constant is of great importance for the prediction of radiative transfer in participating media. In the present work, an improved firework algorithm was applied to estimate the particle size distribution and optical constant simultan...

Micro structure grating is a widely used electronic component. The geometric parameters of one-dimensional rectangular aluminum matrix grating are inversely estimated using stochastic particle swarm optimization (SPSO) algorithm. The theoretical overview of rigorous coupled wave analysis (RCWA) algo...

To investigate the radiation sampling of the translucent media and optimize the parameters of a plenoptic camera, a backward ray tracing model is established based on the paraxial approximation in this paper. Considering the integrating properties along the sampling path of the translucent media, se...

Lamb wave gas sensor has broad industrial application prospects in gas sensing due to its advantages of high sensitivity, low loss and multi-mode characteristic. However, Lamb wave gas sensor is now still in fundamental academic research period. Experiments concerning the sensor are implemented by n...

Research on calibration method of hot-wire probe in compressible fluid is carried out to meet usage requirements of various velocity measurements. The logarithmic calibration mathematical model is studied and it is discovered that there is a problem of matrix singularity in the process of solving ca...

The temperature of water vapor and moist gas will drop greatly in the sonic nozzle, which leads to the condensation and will have a great effect on the measurements. Aimed at the phenomenon of condensation and self-oscillation of sonic nozzle, an experimental condensation apparatus was set up to obs...

The instantaneous velocity vector fields of the vortex wave field in the channel flow were measured by 2DPIV. The identification of the spanwise vortices is carried out by using the criteria of Reynolds decomposition and swirling strength λ_ci criteria. The distribution characteristics of spanwise vo...

The double coupled Duffing oscillator simulation system is put forward as a method for detecting the signal of gas-liquid two-phase flow patterns in small channel. The double coupled Duffing oscillator simulation and detection system is constructed, which is used to analyze the signal characteristic...

Aimed at the problem of poor effects of cabin comfort and energy saving caused by constant air supply velocity of bridge air conditioning, in the paper, we built the cabin simulation model adopting the CFD method based on the research object, Boeing 737 passenger cabin. And the validity of the CFD c...

Particle-material impact is popular in the nature and industries. In this work, experimental measurement and numerical calculation were carried out to investigate the particle impinging jet effect on the behaviour of material (304 stainless steel). Herein, particle diameter, particle tracking trajec...

Based on the capacitively coupled contactless impedance detection sensor with radial structure, a new method for the flow pattern identification of ductule gas-liquid two-phase flow is proposed by using wavelet packet analysis and K-means algorithm. Firstly, the real part and the imaginary part of t...

Flow pattern is one of the most important parameters of gas-liquid two-phase flow and has great influence on the flow of gas-liquid two-phase flow. In this paper, gas-liquid two-phase flow patterns in a horizontal pipe are analyzed with capacitively coupled electrical resistance tomography (CCERT) s...

The present paper focused on huge wave's feature parameters (e.g. wave shape, wave amplitude, wave length, wave frequency, etc.) and kinetic properties in gas-liquid two-phase churn flow in vertical pipe under different working conditions and conducted experimental study. The effects of flow paramet...

Wire-driven parallel robot (WDPR) provides a new support method for wind tunnel tests due to its effective simulation of the aircraft model's pose, and has a great application potential. This paper gives details of an investigation of stability and aerodynamic interference referring to the applicati...

In order to explore the feasibility of using injection technology to reduce the start Mach number of hypersonic inlet, the flow field of the two-dimensional hypersonic inlet was calculated by numerical simulation. The effect of injection on the hypersonic inlet was analyzed by comparing the flow fie...

Insects are often disturbed by lateral wind when flying in nature. Thus understanding the variation of aerodynamic force of the flapping wing under the lateral wind is significant to the research on flying mechanism of insects. The fluid fields around the flapping wing under the lateral winds were s...

Based on the sparsity or compressibility of the signal, compressed sensing (CS) theory can achieve high-accuracy reconstruction of the signal by sampling a small amount of data. In this paper, CS theory was used for the image reconstruction of electrical capacitance tomography (ECT). First, using th...

Tomographic reconstruction is the core step of tomographic particle image velocimetry (Tomo-PIV) technology to realize the reconstruction of three-dimensional position and intensity information of particles (3D particle field). Compared to the Tomo-PIV based on the multiple conventional cameras, a s...

Magnetic induction tomography (MIT) has promising applications in biomedical examination and diagnosis. In order to acquire biological tissue characteristic information, a magnetic induction tomography system with multi-excitation frequency mode is designed. The system operates under voltage excitat...

To ensure that the electrical capacitance tomography (ECT) system meets the requirements of multiphase flow parameter measurement in aerospace field, an ECT system based on the CPCI industrial bus standard is designed. A high-performance field-programmable gate array (FPGA) chip is used as the main ...

This paper focuses on the lack of the sensitivity coefficient information and the low utilization of the measurement voltage in FCM clustering algorithm in electrical impedance tomography (EIT) technology, and proposes a new imaging algorithm. In the new algorithm, sensitivity matrix information is ...

The traditional method to measure the phase holdup of three-phase flow is only for some single phase. In order to solve this problem, models to predict the phase holdup were established and a non-invasive method was proposed for the measurement of each phase holdup in three-phase flow based on capac...