Features of vortex trace propagation for aircraft with propellers

The article presents the results of a study characteristics wake vortex aircraft with turboprop engines. Using example An-12 aircraft, it is shown that rotating propellers make noticeable contribution to propagation trail behind aircraft. This proved by some studies, as well numerous observations. It also describes technique for studying propellers. method based on discrete vortices. relevance such studies due growing interest carrier companies in has been proven when transporting passengers and cargo vessels over distances 700–800 km, maintenance fuel costs are reduced about 30–40%. Therefore, fleet An-22, An-70, An-12, Tu-95, Il-38, C-130, etc., preserved so far. New being developed put into operation: A-400M, Il-114, Il-112M. poses danger other flying behind. A feature interaction vortices coming off airframe from As result, rotation all screws one direction, symmetry broken descending right left halves wing. important understand how differently descend an engines behave. For convenience study, accounting effect integrated special calculation software package, In it, calculating vortex, flight weight, speed altitude its configuration, atmospheric conditions, proximity earth, axial velocity core factors taken account. complex passed necessary testing state registration. number measures were carried out validate verify complex, confirming operability programs included reliability obtained it. Antonov-12 form vertical spectra fields perturbed velocities at various presented. noticeably affect circumstance must be account crews