{"id":558431,"date":"2024-11-05T18:21:00","date_gmt":"2024-11-05T18:21:00","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/esdu-820182010\/"},"modified":"2024-11-05T18:21:00","modified_gmt":"2024-11-05T18:21:00","slug":"esdu-820182010","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/esdu\/esdu-820182010\/","title":{"rendered":"ESDU 82018:2010"},"content":{"rendered":"

INTRODUCTION<\/strong><\/p>\n

This Item gives pressure distribution data for the flow of air*
\nover four families of blunt forebody at zero incidence;
\nellipsoidal, spherically-curved nose with radiused shoulder,
\nspherically-blunted cone and spherically-blunted tangent ogive. The
\nfamilies chosen (see Section 3) cover most of those likely to be
\nused in missile and re-entry body applications. Included among the
\nfamilies are those considered in Item No. 68021 (Reference 21) and
\nItem No. 80021 (Reference 24) and as such the present Item acts as
\na companion to those two.<\/p>\n

The ranges of geometry and Mach number covered for each family
\nare as wide as possible dependent on the availability of data. The
\npressure distribution data are presented (Section 4) in a direct
\nform as a ratio of the local static pressure to the stagnation
\npressure at the nose of the forebody, while methods of estimating
\nthe stagnation pressure itself are given in Section 5. The
\nabscissal parameter was selected as that being most appropriate to
\nthe family under consideration. In this respect data for forebody
\nfineness ratios (lf<\/sub><\/i>\/D<\/i>of 0.5 or less
\nare presented against a dimensionless radial co-ordinate,
\nY\/R<\/i>, which satisfactorily accommodates the case of the
\nflat face, while for forebody fineness ratios of 0.5 or more the
\ndata are presented against an appropriate dimensionless axial
\nco-ordinate.<\/p>\n

Section 6 provides a means of estimating, for inviscid flow, the
\nsurface Mach number distribution and the temperature distribution
\nwith no heat transfer from the corresponding pressure
\ndistribution.<\/p>\n

Section 7 considers the accuracy and applicability of the data,
\nwhich will typically be used in loading applications.<\/p>\n

Section 8 lists the sources of data, both theoretical and
\nexperimental, used to derive the data given while Table 10.1
\nprovides a breakdown of the sources of data used for each pressure
\ndistribution Figure.<\/p>\n

Section 9 gives a worked example concerning a typical
\napplication of the Item.<\/p>\n

Appendix A summarises the geometrical relationships defining the
\nforebody shapes used in this Item. Also included are relationships
\nfor surface length, which is sometimes used in experimental work,
\nfor example in defining the pressure hole locations on test
\nbodies.<\/p>\n

The data for the hemispherical head are used in Appendix B to
\ndescribe the flow development over a typical blunt body as the
\nfree-stream Mach number traverses the full range from low subsonic
\nto high supersonic.<\/p>\n

* Any formulae or theoretical methods used to generate data in
\nthis Item requiring a value of the ratio of specific heat capacity
\nat constant pressure to the specific heat capacity at constant
\nvolume used 1.4 for air.<\/p>\n","protected":false},"excerpt":{"rendered":"

The pressure distribution at zero incidence over selected families of blunt axisymmetric forebodies<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ESDU<\/b><\/a><\/td>\n2010-04-01<\/td>\n63<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":558438,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-558431","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\/558431","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\/558438"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=558431"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=558431"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=558431"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}