This work focuses on the numerical and experimental analysis of turbocharger selection boost pressure effects a CNG-fueled spark-ignition engine. Because this, investigations are carried out influence downsized compression ratio 10.5:1 at different pressures compared with naturally aspirated 12.5:1. In order to perform experimentation, twin-cylinder, port fuel-injected, CNG engine 15.5 kW 3400 ...

Rotating stall contributes to global oscillation vibration problems, accompanied by noise and possible turbomachinery damage. This study with special emphasis on the vaned diffuser investigates unsteady pressure interaction within pump. A low specific speed centrifugal pump (ns = 69), fitted a is modeled studied. The model performance curve shows characteristic positive slope at 30% of best eff...

A method is presented for the quick and accurate prediction of the stability of aerodynamically excited turbomachinery using real eigenvalue/eigenvector data obtained from a rotordynamics model. An expression is presented which uses the modal data and the transmitted torque to provide a numerical value of the relative stability of the system. This approach provides a powerful design tool to qui...

This paper presents a fuzzy knowledge-based system for turbomachinery diagnosis. Given symptoms associated with a vibration problem, the system can identify and rank possible causes by performing incremental forward chaining. The diagnostic system incorporates an attribute weighting component to reflect the relative significance of conditional attributes, thereby allowing the system to produce ...

MEMS are regarded to be an enabling technology allowing the development of smart products by augmenting the computational ability of microelectronics with the perception and control capabilities of micro-sensors and micro-actuators. MEMS technology makes possible the integration of microelectronics with active perception and control functions, thereby, greatly expanding the design and applicati...

For jets, large eddy resolving simulations are compared for a range of numerical schemes with no subgrid scale (SGS) model and for a range of SGS models with the same scheme. There is little variation in results for the different SGS models, and it is shown that, for schemes which tend towards having dissipative elements, the SGS model can be abandoned, giving what can be termed numerical large...