INTRODUCTION<\/p>\n
In Reference 10 the Lighthill nominally-exact method for
\nincompressible inviscid flow has been used to design a family of
\nlow-speed aerofoils having low-drag characteristics by virtue of
\nthe attainment of a roof-top pressure distribution on the upper and
\nlower surfaces at the extremes of a specified incidence range. The
\nmethod provides for independent modification of the leading-edge
\nradius and trailing-edge shape. An appendix to the report contains
\ndetails of the geometric and aerodynamic characteristics of 240
\nsymmetrical and 720 cambered aerofoils derived by the method.<\/p>\n
In view of the availability of such a large variety of aerofoils
\n(see Tables III and IV) and their associated aerodynamic
\ncharacteristics in incompressible inviscid flow it seemed pertinent
\nto attempt to correlate the data with a view a) to check and extend
\nexisting correlations in the ESDU Aerodynamics Sub-series of Data
\nItems and b) to develop correlations for parameters not previously
\ncovered. The particular aerodynamic parameters chosen for study
\nwere lift-curve slope, zero-lift incidence, zero-lift pitching
\nmoment coefficient and chordwise position of the aerodynamic
\ncentre.<\/p>\n
Since the aerofoils derived in Reference 10 were all, members of * See sketch on Figure 4a.<\/p>\n","protected":false},"excerpt":{"rendered":" Correlations for some aerodynamic characteristics of aerofoils in incompressible inviscid flow<\/b><\/p>\n
\na single family there was a danger that correlations using these as
\na basis would be inapplicable to aerofoils not in that family. This
\nwas felt to be of particular significance with regard to those
\ncorrelations which were camber-dependent, since there are only two
\nbasic camber-line shapes for the whole range of aerofoils in
\nReference 10. These are the simple-arc and reflex types and they
\nare illustrated in Section 2.4. With these points in mind, data for
\na number of additional aerofoils (see Tables I and II) obtained
\nfrom other sources3 ,11 Were used in ,the correlations. The- data
\nfrom Reference\u00a0 all relate to symmetrical aerofoils and were
\nobtained using either exact or accurate approximate methods. The
\ndata referred to as Reference 11 were derived, using the
\nnominally-exact method of Reference 9, for a range of aerofoils,
\nboth symmetrical and cambered; among these were members of the NACA
\n6 and 6A series5 and the RAE 100 to 104 and 2800 series12 The
\ncamber-line shapes for these additional aerofoils were mainly of
\nthe simple-arc type but included examples of the reflex and
\n"double-hump"*<\/sup> types.<\/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 1972-12-01<\/td>\n 37<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":559933,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-559924","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\/559924","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\/559933"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=559924"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=559924"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=559924"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}