Published July 1, 1991
by Taylor & Francis .
Written in English
|The Physical Object|
|Number of Pages||323|
Includes papers presented at a symposium, which represent the state-of-the-art in the development of base bleed projectiles and related research, and are from recognized experts in the field. The papers have undergone a thorough review process. The base bleed method is applied to reduce the base drag by varying the value of parameters, the bleed quantity (I) and the bleed area ratio (ϖ).Cited by: 1. A numerical study of the base drag reduction of axisymmetric body projectiles in supersonic flight using a base bleed injection is presented in this paper. Unsteady computations of compressible viscous flow have been achieved in order to investigate the coupled effect of the bleed temperature and the bleed mass flow rate on the base by: The base bleed effect of a two-dimensional body with different slot widths at the trailing edge is examined. It is shown that the value of the maximum base pressure depends on the slot width but in all cases corresponds to the same value of the momentum flux density. This parameter is determined only by the body drag.
Projectiles with base bleed reduce the base drag through burning solid propellant into the base area. After validating the case for different Mach numbers, the projectile is subjected to change in boat-tail angle for further drag reduction. A higher drag reduction is obtained by the combination of boat tail and base bleed. Many printers ask you to provide ⅛” or” bleed on all printing documents. Using a inch bleed will make your final file size inches wider horizontally and inches taller vertically. As an example, if you’re printing an 8” x 10” rectangular document, you’ll need to add inches to each size. Bleed is a printing term that refers to when printed objects on a page, such as images, background color, or graphics, extend past where the publication will be trimmed. This ensures your printed objects reach all the way to the edge of the page. Bleed manuscript layout for a 6" x 9" ( x cm) book Bleed for your cover For production reasons, all covers need to have bleed. All publications are trimmed ” ( mm) along their edges at the end of production for quality control. When calculating your cover size please take this into account.
Numerical simulations are carried out to investigate the base drag and energy characteristics of a base-bleed projectile with and without containing the effect of a post-combustion process for a boattailed afterbody in a supersonic flow, and then to analyze the key factor of drag reduction and pressure decreasing of base bleed projectile. The principle is to append a base bleed unit filled with propellant to the bottom of conventional projectiles, named base bleed projectile, as schematically shown in Fig. 1(a). The base bleed unit injects gas with a low velocity and high temperature into the base recirculation zone, increasing the base pressure and subsequently reducing base drag. Name the size and enter your book’s trim size into the Width and Height fields (with bleed added). Add in ( mm) to the width and in ( mm) to the height. For example, if your trim size is 6 x 9 in ( x cm), set the page size to x in ( x cm). Pages might round in . The base bleed coefficient was varied from C q =() x ⁴, and various bleed outlet locations in the base area were considered. Bleeding air around the periphery of the base area was found to be the most effective implementation, and depending on the outlet location the drag reduction ranged from .