Nomogram Analysis for Ducted Fans with Pre‐rotation: A Method Extended to Include the Flow Condition in which an Upstream Swirl Velocity Exists

Abstract

IN order to determine the performance of a ducted fan over a range of off‐design operating conditions it is possible to use the nomogram method of analysis described by J. F. M. Scholes. The method requires the use of a number of charts, each one being applicable only to a single radius ratio. Moreover each chart depends on the aerofoil characteristics of the blade element, so that it applies only to a single section shape operating at a given Reynolds Number. No account is taken of interference effects or compressibility. Despite these limitations the nomogram method may be valuable if it is required to analyse a number of fans employing the same blade section over a similar range of Reynolds Numbers.

Citation

Gibson, M.M. and Norbury, J.F. (1960), "Nomogram Analysis for Ducted Fans with Pre‐rotation: A Method Extended to Include the Flow Condition in which an Upstream Swirl Velocity Exists", Aircraft Engineering and Aerospace Technology, Vol. 32 No. 1, pp. 23-25. https://doi.org/10.1108/eb033199