An operations center was designed for the Cooperative Convective Precipitation Experiment to facilitate the task of coordinating research activities. This paper describes the facilities of the center and the role of the operations team-consisting of a director and supporting instrument systems coordinators-in its development and daily use. Features of this center should be of interest to personnel planning large meteorological field experiments involving complex, integrated research operations.
An aircraft instrumentation system for cloud nucleation studies has been developed. It continuously measures and records ice nucleus concentration, aerosol concentration and size distribution in the 0.5–9 μ range, temperature, dew point, static pressure (altitude), dynamic pressure, magnetic heading, ground speed, and drift angle.
ENGINEERING NOTES 893 'R 0.99 0.98 0.02 0.01 -----NON MIXING • --MIXING 0 0.02 £ 0.04 0.06 Fig. 2 Effects of fan exit profiles on nozzle thrust and breakeven fan efficiency.
ResultsSample results were calculated for the case where the compressure pressure ratio is 1.5, M 0 = 0.85, and M c = 0.5.The reduction in net thrust of the fanstream vs e is shown in Fig. 2. It can be seen that the mixing losses introduce a substantial penalty. It is also evident that substantial increases in compressor efficiency must be achieved to overcome the losses due to nonconstant enthalpy distribution if substantial mixing occurs. The quadratic nature of the losses due to nonconstant enthalpy make the concept of using slight variations in enthalpy quite attractive.Although these calculations are based on the simplified model of a perfect engine, it is expected that the predicted tendencies for the ratio of the net thrusts will remain quite accurate.
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