NACA Report No. 106
NACA Report No. 106 - Turbulence in the Air Tubes of Radiators of Aircraft Engines was issued by the United States National Advisory Committee for Aeronautics in 1921.
Summary[edit]
NACA Report No. 106 describes an investigation of the flow characteristics in the air passages of aircraft radiators. This work was requested by NACA and was performed by the Bureau of Standards.
The primary requirement of a cooling radiator is that it shall dissipate heat; and for cooliug the engines of aircraft it is essential that the head resistance shalI be low. But both heat transfer and head resistance are greatly affected not only by the speed of air past the cooling surfaces, but by the character of the flow-whether the air passes through the radiator in smooth streams, or with eddies and vortices. If the flow is turbulent, the questions arise whether the turbulence can be increased by changes in construction, and if so whether the result is beneficial or harmful to the general performance of the radiator. This report presents experimental evidence bearing on the problem, and presents some conclusions based on that evidence.
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