Validation of the Small Hot Jet Acoustic Rig for Aeroacoustic Research

The Effects of Surfaces on the Aerodynamics and Acoustics of Jet Flows

“…The free-field prediction at R/D = 100 and ψ = 90 degrees using the model of Tam and Auriault 15 compared with the experiment of Bridges and Brown. 17 The jet operates at M j = 1.00 and T T R = 1.00 from the convergent SMC000 nozzle with D = 0.0508 m. Tables 1 and 2, respectively.…”

“…Figure 10 shows the prediction compared with the experiment of Bridges and Brown. 17 The Sound Pressure Level (SPL) per unit St is represented on the y-axis, where St = ωD j /u j is the Strouhal number. The prediction captures the peak intensity and the nearly correct decay of intensity at high frequency.…”

“…Following the steady RANS assessment, a statistical noise prediction approach is described and compared with measurements of Bridges and Brown. 17 Then, noise predictions of the isolated jet are compared to the jet with a flat plate at various positions. Finally, a conclusion of this study and related future work are discussed.…”

On the Scaling of Small, Heat Simulated Jet Noise Measurements to Moderate Size Exhaust Jets

“…The total temperature ratio of the jets is expressed in terms of the core flow total temperature TTR, o,.e , or the total temperature of the flow after it is (hypothetically) hilly mixed, TTR,,,;,. Extensive description and qualification measurements of this facility can be found in Bridges and Brown [4]. Because the pressure upstream of the nozzle throat in the bypass stream is the same as in the core flow, a reasonable assumption is that the exit Mach numbers of both streams is the same, while the TTR of the annular stream is ---1.…”

“…(4) and dependent on the helium concentration. The proper molar mass of helium can easily be calculated in order to equate aheated and a,,,ix .…”