An Analysis of Transient Flow in a Duct of Varying Cross Section.

摘要

The transient flow in a bellmouth inlet is analyzed using a finite difference approximation to the one-dimensional equations of motion for a perfect gas. A brief derivation of the equations and a description of the method of solution are presented. The feasibility of measuring airflow in the bellmouth is evaluated for step and periodic disturbances. Plots of gain and phase angle of the airflow response versus driving frequency,airflow variation with time,and pressure variation with time and length are presented for a typical bellmouth. A listing of the computer program and instructions for its use are also presented. (Author)