Primary Discuss Of Icing Wind Tunnel Cloud Parameters Variation Law

Icing wind tunnel is the main ground test instrumentality of aircraft icing research, with a difficulty in icing cloud controlling. According to the urgent necessary of icing wind tunnel which is planned to build in our country, and the research actuality of a rough icing wind tunnel cloud physical model home and aboard, theoretic analyses and numerical modeling was carried out on icing wind tunnel cloud occurrence, movement, variation in this thesis, aiming at a complete analysis of icing wind tunnel cloud variation law.In the preface of the thesis, introduction of the background of icing wind tunnel cloud research, and brief discussion of existing icing wind tunnel cloud physical model was presented, educed the work in the thesis.In the second chapter, analysis of the physical phenomenon of icing wind tunnel flow field, spraying, droplets moving and varying in cloud was reviewed, guided by the commercial CFD software FLUENT DPM (Discrete Particle Model). In this way, the suitable flow field model, spraying model, droplet movement model, droplets collision model, droplet break up model, droplet heat and mass transfer model and wind tunnel wall model, as well as numerical analysis method with each model was confirmed.In the third chapter, analysis and demonstration of some spraying related physical model and parameters was prosecuted based on the need of numerical simulation, which includes: 1) Discussing and establishing suitable material physical property database for components in icing wind tunnel environment. 2) Simulating the supercooled droplet movement in flow flied, checking out droplet interior flow filed in its deforming process, analyzing the droplet characteristics and flow field parameters influence on droplet deformation and drag coefficient. 3) Analyzing three kind of injections model and establishing a anticipant file injection which fits the spraying simulation with PDPA measurent on atomizer SUJ11 spraying characteristics.In the fourth chapter, investigation of the icing wind tunnel cloud was implemented in accordance to above chapters'physical models and parameters, which includes: 1) Modeling of portion of icing wind tunnel, simulation and analysis of flow flied and its influence factors. 2) Discussing the physical factors and their impacts on droplet movement and variation in icing wind tunnel in 2D simulatoin, which proves the main factors in droplet final diameter is the flow flied humidity and droplet initial temperature, the main factors in droplets movement and space distribution is the flow filed turbulence intensity and droplet injection angle. 3) Integratively simulating and analysing the icing wind tunnel cloud in 3D simulation, whose results demonstrated that the humidity and droplets initial temperature influence the cloud MVD, and turbulence intensity, droplet injection angle, flow velocity, MVD etc. influence test section LWC and its distribution; a validation simulation represents good agreement between the LWC distribution simulation result and abroad research result.At the end of this thesis, review of the work was given, also presented the shortage of the work and the direction about the future research.