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 Critical pressure ratio (convergent-divergent pressure ratio)  Demonstration of choking effect  Determination of airflow rate  Nozzle thrust  Nozzle efficiency  Determination of flow rate at the narrowest cross-section of a nozzle The critical pressure ratio and the efficiency of nozzles can be determined using the experi- mental set-up HM 260. It is possible to insert various nozzles or a baffle plate into the force measurement device. The test chamber is fitted with two air connections. Different forces can be determined using the different inserts and air connections. The distance between nozzle and baffle plate is adjustable. The nozzle air inlet pressure is adjusted using a pressure controller. The back pressure is set with a needle valve at the mass flow meter. The following data are measured: airflow rate of air, air temperature, pressure at inlet and outlet of the nozzle and force.  Nozzle and baffle plate system with variable distance  Measurement of nozzle thrust or baffle plate force  Relationship of nozzle pressure, back pressure and critical pressure ratio  Demonstration of„choking effect“  Determination of nozzle efficiency Experiments Technical description HM 260 NOZZLE PERFORMANCE STUDY SYSTEM 02/2003 1/2 Page G.U.N.T. Gerätebau GmbH, P.O.Box 1125, D-22881 Barsbüttel, Phone +49 (40)670854-0, Fax +49 (40)670854-42, E-mail [email protected], Web http://www.gunt.de We reserve the right to modify our products without any notifications.

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