Turbulent Jets by N. Rajaratnam

By N. Rajaratnam

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81. Fig. 2-4. Circular turbulent jets - Goertler-type solution. 045 m with a velocity of 87 m/sec. Further observations have been made Reichardt (1942, see Schlichting, 1968), Corrsin (1946), Hinze and Zijnen (1949), Albertson et al. (1950), and others. I25 I00 U - 075 050 0 25 0 0 05 15 10 20 25 772 b Fig. 2-5. Comparison of Trupel’s observations with the Tollmien solution. , 1963. ) Fig. 2-6. Comparison of Reichardt’s observations with Tollmien and Goertler-type solutions. , 1963. ) 45 80 + 60 "0 Urn 40 - L *'O OO 10 30 20 40 50 X d Fig.

It is found that near the axis of the jet, the Goertler-type curve is slightly superior to the Tollmien curve whereas in the outer regions, the Tollmien curve agrees with the experimental observations much better than the Goertler-type curve, This trend has also been observed while analyzing the results of other investigators. 066. 076. Abramovich (1963) finds that a increases linearly with the ratio of the average to the maximum velocity at the nozzle. Further, the value of a appears to increase with the turbulence level of the jet.

In this chapter we will discuss only the region of fully developed flow and return to the region of developing flow in Chapter 6. -FULLY JET DEVELOPED FLOW REGION Fig. 2-1. Definition sketch of circular turbulent jets. In the region of fully developed flow we find that, at any section, u decreases continuously from a maximum value of u, on the axis to zero for large values of r. L b Fig. 2-2. Velocity distribution in circular jets - Trupel’s observations. , 1963. ) have the same shape as shown from Trupel’s measurements (Abramovich, 1963) in Fig.

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