By Ron Mackay, Perry Manley, Don Greer
New hide artwork! The Bristol Blenheim opened WW II for RAF, flying the 1st operational sortie of a British bomber in WW II. utilized in each theater the place the British fought, the Blenheim observed motion over Europe, the North African deserts, and the jungles of Asia. Blenheim's have been tailored to many jobs now not expected by means of its designers: fighter, picture reconnaissance, floatplane, and evening fighter. Over one zero one pictures, forty element drawings, 2 pages of scale drawings, thirteen complete colour work. 50 pages.
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Extra info for Bristol Blenheim
2 is given in Figs. 15 for wedges and cones. The overall influence of blunting on the rate of heat flow at the wall is small for laminar boundary layers (Ref. 2). Leading edge or nose blunting affects the point of transition between laminar and turbulent flow through changes in the following quantities: (a) Mach number, (b) unit Reynolds number and (c) pressure gradient. 6 the transition Reynolds number depends only moderately on the Mach number and the unit Reynolds number, while the pressure gradient has a large influence.
6 Transition from laminar to turbulent flow in boundary layers Because the rate of heat flow in boundary layers is many times greater for turbulent flow than for laminar flow, a knowledge of the transition point is important for problems of aerodynamic heating of structures. Despite large efforts in both theory and experiment, it is still difficult to predict transition accurately. The reason for this is the large number of parameters upon which transition depends and—in many cases of interest—the difficulty of controlling infinitesimal disturbances, which may be amplified, if the boundary layer flow is unstable, and finally cause transition.
This point of instability is different from and lies upstream of, the point of transition. If the level of disturbances is low, the HEAT TRANSFER IN HIGH SPEED FLIGHT 37 distance is large between the instability and the transition point; the latter is, however, important for the heatflowto the wall. In most cases transition does not occur at a fixed point, but spreads over a region which may be considerable in extent. Observations seem to indicate that the instantaneous flow at any point and at any time is either fully laminar or fully turbulent.