METHOD OF FORMING MODEL FOR PREDICTING FORMATION OF CONDENSATION TRAILS OF AIRCRAFT WITH SPECIFIC TYPE OF GAS-TURBINE ENGINE USING QUANTITATIVE INDICATORS FOR FORMATION OF CONDENSATION TRAILS AND POSSIBILITY OF REDUCING IMPACT OF ENGINE EMISSION ON GREENHOUSE EFFECT Russian patent published in 2012 - IPC G01W1/02 

FIELD: physics.

SUBSTANCE: invention relates to aviation and ecology and can be used to detect conditions of adverse effect of aircraft engine emission on climate change and developing methods of abating that effect. The following is measured on cruise flights at different altitudes: pressure p, outside air temperature t_oa°C (T_oa°K), relative humidity (φ_oa, %) of atmospheric air, flight speed (number M), full gas temperature behind the low-pressure turbine rotor frequency n (engine operating mode), fuel consumption G_F. Using these data and design characteristics of a specific engine, the full gas temperature behind the mixing chamber is calculated, the average temperature of the mixed jet T_{mix av} is calculated, the curve h_Σ=f(H) is plotted and from the condition h_Σgr.calc.=0 the limiting height of formation of the condensation trace H_{0 gr.msd} in standard atmospheric conditions is determined; the total humidity over-saturation indicator h_Σexp. is then calculated for each specific experiment based on the measured parameters in flight taking into account the specific type of the engine; the limiting value the total vapour over-saturation indicator h_Σgr.exp. is calculated for the specific type of the engine; the values h_Σgr.calc. and h_Σgr.exp. are compared. If h_Σgr.calc. and h_Σgr.exp. are different, T_{mix av} is refined based on characteristic features of the specific aircraft with a specific type of engine.

EFFECT: technical result from using the disclosed invention is the possibility of more reliable and more accurate determination of the limiting height of formation of persistent condensation trails for aircraft with a specific type, design and arrangement of gas-turbine engines, which enables to give recommendations for the type of aircraft under investigation to fly in a range of altitudes without forming persistent condensation trails, i.e., with minimum impact on the greenhouse effect.

5 dwg