The Design And Characteristic Research Of The Inertial Stage With Anti-ice

When facing the cold weather and there being a lot of supercooled water droplets above the sea, as the first step inertial stage, it will encounter icing. If it works in such a bad environment for long, air intake passages of it will be even plugged seriously, so it is necessary to study the inertial stage with anti-ice performance.When an inertial stage having a function of Anti-icing by hot gas is designed, the filtration efficiency which can achieve the intake requirement must be satisfied in the normality. And the pressure loss is reduced as much as possible in the precondition that the inlet filtration efficiency can be ensured. In the condition that the inlet filter efficiency can be ensured , resistance loss is reduced as much as possible; When the above requirements are met and freezing state(Intake containing a large number of cold water)is considered, inertial grade inlet and inner flow passage are guaranteed to unfrozen , the loss of drip trough of hydrophobic by ice is prevented, and blockage of drainage inlets by ice is prevented.Under the premise above, several aspects of the work in this dissertation below are completed.1 .The anti-ice device's realization means being taken as the starting point and the structural characteristics of the normal inertia stage being combined, several kinds of inertia stage model with anti-ice characteristic are designed. Though reviewing the resistance characteristics of it in the dry state and the efficiency characteristic of droplet in the hygrometric state, the satisfactory models in it are chosen for the further development of anti-ice characteristic.2.Reynolds-averaged N-S equation are chosen as the control equation, model selection criteria are chosen as the turbulence model, and discrete-phase model (DPM) are used to simulate several anti-icing inertia of gas-liquid two-phase flow field designed in this dissertation. The influence of its structural characteristic to the resistance loss is analyzed deeply to provide guidance for the subsequent optimized design. The characteristic which water drop concentration distributes in the two-phase flow-field of the model changes with the changing of the particle diameter and inlet velocity is analyzed deeply, and its filtering efficiency characteristic is studied.3.Multi-media model is used to establish the control equation of gas-liquid two-phase flow of the air and supercooled water, the running track of the cooling water in inertia-channel is simulated, then another kind of formula which fits for Euler algorithm local collection coefficient is established by the definition formula of local collection coefficient. This formula is used to calculate the local collection coefficient on the leaf surface of selected models chosen to provide guidance for more in-depth study of De/Anti-icing in the future.