Hydraulic characterization of high-pressure gasoline multi-hole injector

Abstract

Hydraulic characterization of high-pressure gasoline multi-hole injector. Flow Measurement and Instrumentation.

Study of spray structure under flash boiling conditions using 2phase-SLIPI

“…Multiple scattering thus makes it difficult for conventional laser sheet imaging to verify whether or not the image represents the real spray structure, especially in the near nozzle region. According to the rate of injection measurements reported previously (Mohan et al, 2018), the hydraulic delay of this injector is 0.48 ms. Time after start of injection (Time aSOI) and time after start of excitation (Time aSOE) therefore has the following relation: T imeaSOI = T imeaSOE − 0.48ms. In the following sections, Time aSOE will be used to describe the timing of the transient spray event.…”

Auto-ignition characteristics of high-reactivity gasoline fuel using a gasoline multi-hole injector

“…The injection rate measurements were performed using a spray momentum flux method. Details of the measurement principle can be found in [30]. Fig.…”

Evaluation of the single jet flow rate for a multi-hole GDI nozzle

“…Relationship between volume rate and chamber pressure rise over the time expressed by equation 16is derived from the definition of the fuel bulk modulus (15). As the mass flow rate is equal to the volume rate multiplied by the fuel density ρ (assumed as constant during the injection event), a relation between mass flow rate and pressure variation over the time is achieved (17).…”

“…The spray momentum technique is an established and reliable measurement based on the detection of the spray impact force that allows the evaluation of the momentum flux exiting each hole of a multi-hole nozzle [14]. Momentum flux is an important spray parameter which can be correlated to cavitation inside the nozzle hole [15], spray penetration [16] and mass flow rate [17]. This technique is applicable to the single plume and so can be used to evaluate the individual hole flow rate.…”

“…In some work available in literature the spray momentum was already used to measure the hole-to-hole flow rate but most of them are about Diesel injectors [18], [19], [20], [21], [22] and a robust validation of the methodology is missing. In [17] a GDI injection rate test rig based on spray momentum was proposed but only for the whole nozzle measurement.…”