ESDU 86002

Drag and pressure recovery characteristics of auxiliary air inlets at subsonic speeds.

Abstract:

ESDU 86002 provides methods for estimating the drag and pressure recovery of intakes partially or wholly immersed in the boundary layer. The methods, which are semi-empirical, apply to circular, semi-circular or rectangular scoop intakes, with or without boundary layer diverter, and flush rectangular intakes having a shallow entrance ramp of rectangular or NACA curved-divergent planform. The effect of throat just aft of the lip is derived from theoretical calculations taking account of the velocity profile. Empirical methods, based on a limited database, predicted spillage drag and, for scoop intakes, the contribution from profile drag.

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Details:

Data Item ESDU 86002
Format:	PDF with interactive graphs
Status:	Amendment (D), 01 Jun 2004 Published in Release 2004-02
Previous Releases:	ESDU 86002 Amendment C ESDU 86002 Amendment B
ISBN:	978 0 85679 554 1

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This Data Item contains 33 interactive graph(s) as listed below.

Graph	Title
Figure 1 - Part 1	Mass flow ratio
Figure 1 - Part 2	Mass flow ratio
Figure 2 - Part 1	Momentum flow ratio
Figure 2 - Part 2	Momentum flow ratio
Figure 3 - Part 1	Total pressure recovery
Figure 3 - Part 2	Total pressure recovery
Figure 4 - Part 1	Ram pressure efficiency
Figure 4 - Part 2	Ram pressure efficiency
Figure 5	Datum drag coefficient at full mass flow for scoop inlets
Figure 6a	Spillage drag at zero mass flow for sharp-lip scoop inlets - basic data
Figure 6b	Spillage drag at zero mass flow for sharp-lip scoop inlets - trend with w²/A₁
Figure 7a	Factor for spillage drag variation with mass flow ratio for scoop inlets - basic data for circular inlets
Figure 7b	Factor for spillage drag variation with mass flow ratio for scoop inlets - basic data for semi-circular inlets and rectangular inlets with w²/A₁ ≥ 4
Figure 7c	Factor for spillage drag variation with mass flow ratio for scoop inlets - trend with w²/A₁
Figure 8a	Factor for effect of profile of scoop fairing forebody on spillage drag - M ≥ 0.6. Elliptical or NACA-1 series profile
Figure 8b	Factor for effect of profile of scoop fairing forebody on spillage drag - M = 0.2. Elliptical or NACA-1 series profile
Figure 8c	Factor for effect of profile of scoop fairing forebody on spillage drag - all M. Sharp lip and linear profiles
Figure 9	Factor allowing for variation of delta P _Ht / P _H0 with mach number for scoop inlets
Figure 10a	Factor on momentum flow ratio to allow for ramp planform and lip shape for flush inlets - round lip and rectangular or curved-divergent ramp. Sharp lip and rectangular ramp
Figure 10b	Factor on momentum flow ratio to allow for ramp planform and lip shape for flush inlets. Sharp lip and curved-divergent ramp.
Figure 11	Drag coefficient at zero mass flow for flush inlets
Figure 12	Effect of ramp angle on C'_Dfl for flush inlets
Figure 13	Effect of Mach number on C'_Dfl for flush inlets
Figure 14	Factor for spillage drag variation with mass flow ratio for flush inlets
Figure 15a	Incremental drag coefficient correction for flush inlets - rectangular ramp
Figure 15b	Incremental drag coefficient correction for flush inlets - curved-divergent ramp
Figure 16	Factor on ram pressure efficiency due to mass flow ratio for flush inlets with rectangular ramp
Figure 17	Maximum ram pressure efficiency for flush inlets with curved-divergent ramp
Figure 18	Mass flow ratio for maximum ram pressure efficiency for flush inlet with curved-divergent ramp
Figure 19a	Incremental corrections to maximum ram pressure efficiency for flush inlets with a curved-divergent ramp - effect of mass flow ratio
Figure 19b	Incremental corrections to maximum ram pressure efficiency for flush inlets with a curved-divergent ramp - effect of effect of ramp angle
Figure 19c	Incremental corrections to maximum ram pressure efficiency for flush inlets with a curved-divergent ramp - effect of aspect ratio
Figure 20	Modified mass flow parameter for sizing flush inlets with a curved-divergent ramp operating at maximum ram pressure efficiency