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Under the hood is Nissan's versatile VQ twin-cam engine, which breathes with the help of variable intake geometry and variable-valve timing.
The present computations involved cases with different incoming wind directions and changes in the intake geometry.
An optimal shape design approach is presented for a subsonic S-shaped intake geometry using aerodynamic sensitivity analysis.
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For the port flow the objectives were (1) to minimise the pressure loss between the inlet and the outlet and (2) to maximise the swirl, i.e. the angular momentum r × ρ v around the barrel axis in the cylindrical sub-zone indicated in Figure 6. Figure 6 Intake port geometry and streamlines of the original flow.
Interestingly, Daniel et al. (1989) stated that: (1) to achieve the highest intake rates, the geometry of the entire feeding apparatus must be tuned, and (2) that isometric size increase of the feeding apparatus increases the energy intake rate at all nectar concentrations.
As in the McDonnell F-101 Voodoo, the engines sat low in the fuselage to maximize internal fuel capacity and ingested air through fixed geometry intakes.
Factors not significantly related to SF in this study included dietary intakes, BMD, bone geometry and calf circumference.
The air intakes, designed by Ben Rich, were of fixed geometry without inlet cones, since the J65-powered aircraft was incapable of Mach 2 performance.
Governing factors in HCCI operations such as injector characteristics, injection pressure, piston bowl geometry, compression ratio, intake charge temperature, exhaust gas recirculation (EGR) and supercharging or turbocharging are discussed in this review.
The main components of the cylinder intake port static test configuration geometry that was the optimisation target for this study can be seen in Figure 6.
In addition, air intakes were equipped with variable geometry ramps to regulate airflow to the engines at supersonic speeds.
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