This Data Item is the third in the series of Items concerned
\nwith the prediction of the drag of rectangular planform cavities
\nfor Mach numbers up to 3. ESDU 00006 (Part I) deals with cavities
\nhaving closed flow, and ESDU 00007 (Part II) is for cavities having
\nopen or transitional flow. Those Items are only applicable to
\ncavities without doors, so the present Data Item (Part III)
\ncompletes the series with the provision of methods for the
\nprediction of the drag of a pair of equal width doors open at 90\u00b0,
\ntypical of weapons bay applications.<\/p>\n
The prediction methods use data (where available) from the ESDU
\nAerodynamics Series, and involve planar doors at subsonic or
\nsupersonic speeds. The effects of three types of door leading and
\ntrailing edges are considered: straight (i.e. unswept) with either
\nsquare edges, chamfered (i.e. wedge or chiselled) edges or
\nsawtoothed with chamfered edges. A summary of the door drag
\nprediction components is given, including tables of the components
\nand references to the relevant prediction equations. The way in
\nwhich door drag is used in the determination of the total drag
\ncoefficient due to the presence of a rectangular cavity with doors
\nopen at 90\u00b0 is also given.<\/p>\n
The drag prediction methods for cavity doors were developed The door drag prediction methods use available data from the Drag of a Rectangular Planform Cavity in a Flat Plate with a Turbulent Boundary Layer for Mach Numbers Up to 3 – Part III: Effect of Doors<\/b><\/p>\n
\nusing wind-tunnel data for flat plates at zero angle of attack in
\nuniform flows. As with the methods for the drag of cavities without
\ndoors (ESDU 00006 and ESDU 00007), in order to apply the methods to
\na practical situation in which a cavity with a pair of doors open
\nat 90\u00b0 is in a non-uniform flow, an artifice employed in the
\napplication of excrescence drag data is used, see ESDU 90029. With
\nregard to base drag, ESDU 10017 provides a guide to the
\neffectiveness of the various types of trailing-edge device used to
\nalleviate the drag of blunt trailing edges. The possible use and
\nappropriateness of such devices for weapons bay doors is discussed.
\nIn order to gain some appreciation of the effects on drag of the
\ndifferent door leading-edge and trailing-edge geometries, a set of
\nexamples based on the cavity in Example 2 of ESDU 00006 at
\nM<\/i>1<\/sub> = 0.8 and 2.0 is given.<\/p>\n
\nESDU Aerodynamics Series, but there are three main areas where
\nthere are no suitable ESDU data, and they are dealt with in
\nAppendices A to C. Those areas concern the pressure drag due to
\nblunt leading edges (Appendix A), blunt trailing edges (Appendix B)
\nand chamfered (wedge) leading edges (Appendix C) of flat plates at
\nsubsonic speeds.<\/p>\n","protected":false},"excerpt":{"rendered":"\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ESDU<\/b><\/a><\/td>\n 2011-09-01<\/td>\n 80<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":557471,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-557463","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-esdu","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/557463","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/557471"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=557463"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=557463"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=557463"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}