V/STOL Rotary Propulsion Systems - Noise Prediction and Reduction. Volume 3. Computer Program User's Manual

Abstract

A computer program is presented which allows a user to make performance and far-field acoustic noise predictions for free-air propellers, variable pitch fans with inlet guide vanes, variable pitch fans with outlet guide vanes, fixed pitch fans, helicopter rotors, tilt rotors, fixed pitch lift vanes with remote, integral, and tip-turbine drives, and variables pitch lift fans with remote and integral drives. Noise prediction methodology for drive engines, single stream and coaxial jets, and gearboxes are also included, as well as noise reduction and performance losses of partly sonic inlets and duct acoustic treatment. A description of the program, detailed instructions for its use, required inputs, and sample cases are presented. Related documents include Volume 1 - Identification of Sources, Noise Generating Mechanisms, Noise Reduction Mechanisms, and Prediction Methodology and Volume 2 - Graphical Prediction Methods.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
May 01, 1976
Accession Number
ADA027363

Entities

People

  • B. Magliozzi

Organizations

  • United Technologies Corporation

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Atmospheric Attenuation
  • Bessel Functions
  • Computer Programs
  • Engine Noise
  • Flow Rate
  • Guide Vanes
  • Helicopter Rotors
  • Helicopters
  • Inlet Guide Vanes
  • Lift Fans
  • Mach Number
  • Mass Flow
  • Propeller Noise
  • Propulsion Systems
  • Tail Rotors
  • Turbines
  • Turboshaft Engines

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Aerospace Engineering
  • Computer Science.