Numerical modeling of turbulators interaction with a system of transverse jets in а highspeed flow


Аuthors

Snazin A. A., Sevchenko V. I.*

Mlitary spaсe Aсademy named after A.F. Mozhaisky, 197198, St. Petersburg, Zhdanovskaya St., 13

*e-mail: vka@mil.ru

Abstract

The study of interactions between highspeed flows and gas jets has garnered significant attention in recent years due to its importance in advanced engineering applications. This work presents a comprehensive numerical investigation of the interaction between a highspeed flow and a system of transverse gas jets injected into a channel equipped with turbulators located on its bottom wall. The influence of turbulators on flow stability and mixing efficiency under various configurations is analyzed. Particular attention is given to the effect of turbulator placement on mixing dynamics and flow stability.
The results demonstrate that specific turbulator configurations enhance mixing efficiency and stabilize flow structures, highlighting the potential of turbulator installation on the channel floor for optimizing highspeed flow control in practical applications. The distribution analysis of argon within the computational domain reveals a strong dependence of mixing efficiency on the distance between the turbulators and jets (n/l). For smaller n/l values, argon spreads intensively near the channel floor, forming large counter-rotating vortices downstream, increasing cross-sectional filling. At n/l = 0.41, the argon flow profile becomes more structured, forming three distinct streams, leading to more uniform gas distribution. At n/l = 0.56, the argon concentration increases in the channel's central region.
Turbulators placed upstream of the jets create localized high-pressure zones ahead of them, followed by low-pressure regions caused by flow redistribution. At n/l = 0.33 and n/l = 0.35, the pressure peaks upstream of the turbulators are most pronounced, with well-defined low-pressure zones downstream. Increasing n/l to 0.41 results in the merging of high-pressure zones from the turbulators and jets, yielding a more uniform pressure distribution in the channel. Moving the turbulators downstream of the jets (n/l > 0.47) elongates the high-pressure zones while reducing the prominence of low-pressure regions.
Maximum relative pressure on the upper wall is observed at x/l ≈ 0.57–0.6. Shifting the turbulators closer to the jets moves the shock reflection zone toward the channel exit and reduces maximum pressure values. For n/l > 0.48, pressure peaks stabilize, and shock impact intensity on the channel walls decreases by Δp/p∞ = 22%. Turbulators positioned upstream of the jets (n/l < 0.41) promote concentrated gas mixing in the channel's central region, whereas those downstream (n/l > 0.47) facilitate more uniform argon distribution across the channel width.
Increasing n/l reduces the localized influence of turbulators on the flow, achieving more uniform gas and pressure distributions in the computational domain. Optimal turbulator placement depends on specific requirements: closer placement to jets enhances gas mixing, while farther placement promotes flow uniformity. Adjusting the placement parameters of turbulators significantly impacts the structure of highspeed flow, gas distribution, and pressure characteristics in the channel. These findings provide a foundation for optimizing devices utilizing gas mixing in highspeed flows.

Keywords:

blown gas jet, highspeed flow, mesh adaptation, shock wave

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