Accession Number : ADA299470

Title :   HINCOF-I: A Code for Hail Ingestion in Engine Inlets.

Descriptive Note : Interim rept. 10 May 92-Feb 94,

Corporate Author : PURDUE RESEARCH FOUNDATION LAFAYETTE IN

Personal Author(s) : Gopalaswamy, N. ; Murthy, S. N.

PDF Url : ADA299470

Report Date : AUG 1995

Pagination or Media Count : 74

Abstract : One of the major concerns during hail ingestion into an engine, when an aircraft flies through a hail storm, is the resulting amount and space- and time-wise distribution of hail at the engine face for a given geometry of inlet and set of atmospheric and flight conditions. The appearance of hail in the capture streamtube is invariably random in space and time, with respect to size and momentum. During the motion of a hailstone through an inlet, a hailstone undergoes several processes, namely impact with other hailstones and material surfaces of the inlet and spinner, rolling and rebound following impact, heat and mass transfer, phase change, and shattering, the latter three due to friction and impact. Taking all of these factors into account, a numerical code, designated HINCOF-I, has been developed for determining the motion of hailstones from the atmosphere, through an inlet, up to the engine face. The numerical procedure is based on the Monte-Carlo method. The report presents a description and details of the code, along with several illustrative cases. The code can be utilized, in particular, to relate the spinner geometry - conical or, more effectively, elliptical - to the possible diversion of hail at the engine face into the bypass stream. The code is also useful for assessing the influence of various hail characteristics on the ingestion and distribution of hailstones over the engine face.

Descriptors :   *HAIL, *INGESTION(ENGINES), TURBOFAN ENGINES, AIRCRAFT, DISTRIBUTION, PHASE TRANSFORMATIONS, WATER, NUMERICAL ANALYSIS, MOTION, MONTE CARLO METHOD, SURFACES, CODING, FLIGHT, MASS TRANSFER, STORMS, ENGINES, GEOMETRY, FANS, TURBINES, NUMERICAL METHODS AND PROCEDURES, FRICTION, MOMENTUM, SPINNERS, WINGED INSECTS.

Subject Categories : Meteorology
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE