Thrust-Vectoring Nozzle Performance Modeling

Calculation of Gas Flow in High-Altitude Engine Nozzle and Experience of Using Water-Cooled Nozzle Head during Tests

“…Довольно широко применяется модель k-ε в [11][12][13], в которых рассмотрены различные модели сопел -с охлаждаемой стенкой и без охлаждения, с прямоугольной и тетрагональной сетками, с 2D-и 3Dтечениями [11], со вдувом вторичного газа в сопло [12] и без, с моделированием течения реагирующего потока [11] и холодной продувкой воздухом [13]. Для этих работ общим является то, что отрыв потока в соплах отсутствует.…”

Performance of a Thrust-Vectoring Solution for Unmanned Air Vehicles

“…As presented on figure 3 a loss of thrust at given rotational speed is observed (15% of the thrust is missing @ 92 000 rpm), and the level of temperature in the engine is increased (+130 o for EGT). An increase of the SFC (13% @ 92 000 rpm) was also measured, coupled with an higher compressor pressure- [11] or [12]) by the use of CFD: a discrepancy exists between the effective angle of the flow compared with the deflection angle. Here, the lateral force created is lower than expected, mainly with the configuration having a small cover-distance value.…”

“…This means that the differences of the results compared with the theoretical expectation are only 2 due to the flow pattern. Those kind of discrepancies are the difference between the geometric and the effective vectoring angle, or the flow coefficient, and are presented and modeled in [11] and [12] for IVT solutions. But prior to any evaluation of the performance of the system, the question of the influence of the cover nozzle on the engine behavior must be treated, as was suggested by [13].…”

Performance research of axisymmetric vectoring nozzle based on numerical simulations

“…With the development of aeronautical technology, thrust vectoring nozzle has shown its advantages in many ways [1,2] .A series of investigations had been conducted to study the performance and flow characteristics of thrust vectoring nozzles [3][4][5][6][7][8] . Research results show that nozzle pressure ratios and geometric vectoring angle have significant influences on nozzles' performance.…”