Aerodynamic penalties of heavy rain on landing airplanes
(Previously announced in STAR as N82-30298)
Haines, P.↗
Engineering topics
Luers, J.
Publications and source records attributed to Luers, J..
Heavy rain influence on airplane accidents
The aerodynamic effects of heavy rain on two windshear accidents have been evaluated according to the theoretical results of Haines and Luers (1983). A number of other accidents in which the presence of low-level windshear was a distinct possibility are also discussed. The results indicate that there are two major types of rain-related accidents. In one, the aircraft touches down prior to the runway because increased drag and momentum loss make the aircraft descend below glide slope. In the other, the aircraft loses airspeed while attempting a go-around in the heavy rain environment.
Luers, J.↗
Frost formation on an airfoil: A mathematical model 1
A computer model to predict the frost formation process on a flat plate was developed for application to most environmental conditions under which frost occurs. The model was analytically based on a generalized frost thermal conductivity expression, on frost density and thickness rate equations, and on modified heat and mass transfer coefficients designed to fit the available experimental data. The broad experimental ranges reflected by the extremes in ambient humidities, wall temperatures, and convective flow properties in the various publications which were examined served to severely test the flexibility of the model. An efficient numerical integration scheme was developed to solve for the frost surface temperature, density, and thickness under the changing environmental conditions. The comparison of results with experimental data was very encouraging.
Dietenberger, M.↗