Flow-field Characteristics and Aerodynamic Loads on External Stores Near the Fuselage and Wing-pylon Positions of a Swept-wing/fuselage Model at Mach Numbers of 0.4 and 0.7

Flow-field Characteristics and Aerodynamic Loads on External Stores Near the Fuselage and Wing-pylon Positions of a Swept-wing/fuselage Model at Mach Numbers of 0.4 and 0.7
Author: R. H. Roberts
Publisher:
Total Pages: 150
Release: 1974
Genre: Aerodynamic load
ISBN:

Experimental data were obtained to aid in the prediction of aerodynamic loads and separation-trajectory characteristics on stores under the influence of an aircraft flow field. Four types of data were obtained in the vicinity of a generalized aircraft model: (1) flow field surveys, using a 40-deg cone probe, to determine the local velocity field, (2) force and moment data on four store models, (3) pressure distribution data on an ogive-cylinder model, and (4) captive-trajectory store separation data on one store model. The generalized aircraft model consisted of a swept-wing/fuselage combination with rectangular, flow-through engine ducts.

Self-compensating Store Ejection

Self-compensating Store Ejection
Author: Raymond R. Maestri
Publisher:
Total Pages: 74
Release: 1974
Genre: Aerodynamic load
ISBN:

The report concerns the concept of a continuously adjustable ejector system which accounts for the aircraft flight condition and ejects a store with an initial angular rate and linear velocity that results in a safe, repeatable, predictable nearly ballistic trajectory throughout the aircraft/store carriage envelope. The concept is especially important in the supersonic regime where the aerodynamic forces in the disturbed flow field control the initial trajectory. (Modified author abstract).

The AFFDL-Nielsen Flow-field Study

The AFFDL-Nielsen Flow-field Study
Author: William T Strike (Jr.)
Publisher:
Total Pages: 92
Release: 1976
Genre: Aerodynamics, Supersonic
ISBN:

This test was conducted in support of a program to develop a generalized analytical method for predicting the separation characteristics of stores from a high-speed aircraft (parent body). The tests were conducted in the von Karman Gas Dynamics Facility (VKF), Tunnel A, at nominal Mach numbers of 1.5, 1.76, 2.0, and 2.5 at a nominal free-stream Reynolds number of 4 x 10 to 6th power per foot. The test program involved three phases, namely flow-field surveys using a cone probe rake to determine local flow-field angles and velocity, pressure distributions on the store as it separated from a parent body, and six-component force and moment data on the store. The tests were conducted at angles of attack of zero and five degrees. This document contains a detailed description of the calibration procedure for the 20-deg half-angle cone probes and the method used to evaluate the local flow-field properties from the cone probe surface pressure and pitot pressure measurements. Also included is a comparison of integrated pressure data with the force and moment data obtained on the storebody by a balance. (Author).

Use of the Flow Angularity Technique for Predicting Store Separation Trajectories

Use of the Flow Angularity Technique for Predicting Store Separation Trajectories
Author: Stephen C. Korn
Publisher:
Total Pages: 94
Release: 1971
Genre: Bombs
ISBN:

A method is being developed for solving the store separation trajectory problem by flow angularity techniques. This approach uses experimentally measured interference flow field data coupled with store free stream aerodynamic coefficients. Presently, the flow field about the inboard triple ejector rack loaded with M-117 bombs at Mach 0.85 on the F-4 aircraft is being used to predict the trajectory of other stores launched from the inboard triple ejector rack at subsonic and transonic Mach numbers. Sample comparisons of trajectories produced by the captive trajectory system are presented. This technique allows calculation of the trajectory until the store impacts on the ground. Sample miss distances caused by the interference flow field calculated using the flow angularity technique are presented for the M-117 bomb. (Author).