• No results found

Vortex flow and cavitation in diesel injector nozzles

N/A
N/A
Protected

Academic year: 2019

Share "Vortex flow and cavitation in diesel injector nozzles"

Copied!
22
0
0

Loading.... (view fulltext now)

Full text

Loading

Figure

Figure 1. Nozzle geometries investigated (a) 5-hole nozzle without expansion tubes, (b) 5-holenozzle with expansion tubes and (c) unstructured computational grid for the 5-hole nozzlewith local refinement upstream and at the entry to the injection holes.
Figure 2. Typical image of string cavitation formed inside the nozzle volume at two differentRetime instances with �τ ∼ 100 (a) bottom view and (b) side view (nominal needle lift, CN = 4.0, = 68 000).
Figure 3. Prediction of flow structure inside the sac volume (iso-surfaces inside the nozzle holes and core of the nozzle volume vortex coloured with theaxial velocity component of the incoming liquid, as seen from two different views (nominalneedle lift,structure located in front of hole 5 and (of hole 1, (a) path lines of vortex in frontb) vortical structure at �τ ∼ 100 relative to previous flow, showing the vorticalc) predicted cavitation vapour volume fraction CN = 4.0, Re = 68 000).
Figure 5. Effect of increasing flow rate on two-dimensional temporally and spatially averagedimages of string cavitation probability, showing the initial stages of the development of holeand string cavitation (a) CN = 0.5; Re = 31 000, (b) 0.6; 35 000, (c) 0.7; 39 000 (from Gavaises& Andriotis 2006).
+7

References

Related documents

time, from < 2% to 7-22% of peripheral blood lymphocytes. Further phenotypic characterization demonstrated that the cells were a subpopulation of T cells, and not natural

Abbreviations: MCT: Monocrotaline; SILD: Sildenafil; PVR: Pulmonary Vas- cular Resistance; PAH: Pulmonary Arterial Hypertension; MMP: Matrix Metalloproteinase; RVSP:

A long-term follow up was carried out after surgeries including postoperative QOL and sexual life quality, which were assessed through SF-12 questionnaire and Chinese version

Background: To measure uptake of first invitation to cervical screening by vaccine status in population based cohort offered HPV immunisation in a national catch-up campaign by

In an attempt to establish whether Escherichia coli B infected with N130 (an am- ber mutant defective in gene 46) is recombination-deficient, the postinfection fate of 14C-labeled

In this section we show how ABC-SubSim algorithm can be applied to estimate the ABC evidence by taking advantage of the improvements in parameter space exploration introduced by

As a result, the year 2007 also constitutes a key year in the EU’s preparations for yet another new step in its grow- ing role in the region, best exemplified by the prepara- tions

The purpose of this paper is to quantify such estimation risk in a very general class of dynamic parametric VaR mod- els and to correct standard backtesting procedures to provide