ESDU 78019 gives a correlation of computed results using a
\nmethod that allows iteratively for the displacement effects of the
\nboundary layer and wake. It is found that by plotting the profile
\ndrag of the body as a fraction (the form factor) of the skin
\nfriction on a flat plate with the same transition position at the
\nsame Reynolds and Mach numbers, the data can be correlated and
\nshown graphically simply as a function of body geometry parameters
\nfor a datum condition of transition at the nose, zero Mach number
\nand fixed Reynolds number. Correction factors, also given
\ngraphically, correct the data for different transition positions
\nand Mach numbers from datum. To assist in obtaining the value of
\nprofile drag, additional graphs give the flat plate mean skin
\nfriction for an appropriate range of transition positions, Reynolds
\nnumbers and Mach numbers. The method of correlating the data has
\nbeen found to be accurate within 1 per cent for a range of body
\ngeometry and flow conditions. The computational method itself was
\nfound to agree within 5 per cent with a limited number of reliable
\nexperimental data available in the literature. A worked example
\nillustrates the use of the data. ESDU 77028 gives, for a range of
\nforebody and afterbody shapes, the geometry parameters required for
\nthe use of the correlation.<\/p>\n
Although the method is relatively simple to apply, it is fairly
\ntime consuming to evaluate by hand due to the need to determine
\nsome second-order effects of body geometry. Analytic equations were
\ntherefore developed using the original database, producing a
\nsimplified method given in Addendum A. The equations are easily
\nprogrammed and give a correlation only marginally worse than the
\ngraphical method and, moreover, they extend the method to cover a
\ngreater range of transition positions. Tentative provision is also
\nmade for bodies of smooth non-circular cross section. A computer
\nprogram of the simplified method is provided as ESDUpac A7819.<\/p>\n","protected":false},"excerpt":{"rendered":"
Profile drag of axisymmetric bodies at zero incidence for subcritical Mach numbers<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ESDU<\/b><\/a><\/td>\n 2014-01-01<\/td>\n 45<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":558149,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-558141","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\/558141","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\/558149"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=558141"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=558141"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=558141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}