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Архивы рубрики: Fuel Systems for IC Engines

SUMMARY / FURTHER PROCEDURE

It has been possible to show that raising fuel temperature is technically feasible and produces highly promising results in respect of the spray behavior of a conventional injector for direct injection. The optical results obtained using the schlieren method and the quantitative assessment of droplet sizes and their distribution show that high fuel temperatures have

Relationship Between Injected Mass and Fuel Temperature — Nozzle Behavior

The results achieved so far seem very promising which is why the question naturally arises as to the possibility of implementing this approach in practice. In this context, it is imperative to ascertain how the injection nozzle behaves at different temperatures — in other words, for example, with a very high vapor content in relation

Influence of Temperature and Pressure on Droplet Sizes and Droplet Size Distribution

As described in literature, it was possible to show that the sudden phase transition from liquid to gaseous state takes place in relation to temperature and in a very small temperature window. It can also be proven that it is possible to inject fully vaporized fuel with a conventional injector — apparently without any major

Fuel Phase Transition as Temperature Rises

The phase diagram described above for ROZ 95 in Section 2.4 is once again taken Below as the basis for evaluating the first tests, Figure 17. The phase diagram also Shows the three ranges that are traversed in the course of examination. Figure 17: p-T phase diagram for RON 95 with test cases For each

Optical Measurement Techniques Applied

To show the anticipated effects of increasing temperature in detail, it was decided to use two different optical measurement techniques. The background-oriented schlieren method was applied for visualizing the density gradients, i. e. separation of different spray densities. This is a very good technique for showing the expected changes in vaporization conditions. Additional use of

Optical Pressure Chamber

A test bench with pressure chambers permitting optical access is available at IAV GmbH’s Injection-System Development department for optical fuel-spray studies. This test bench has a high-pressure chamber with operating pressures of 0.5 bar to 100 bar at gas temperatures up to 500°C. The optical access permits the use of transmitted-light methods and has a

Facility for Heating the Fuel

Various solutions were contemplated for varying fuel temperature. In an initial approach, consideration was given to heating the entire volume in the fuel reservoir. On the one hand, this would mean that the fuel, heated to over 400°C, would have had to pass through the entire injector, severely impairing its durability on account of the

PROCEDURE / MEASUREMENT TECHNOLOGY Injector Used

Figure 13: Details of the injector used (nozzle layout, footprint, injector body) As pressure ranges up to an injection pressure of at least 350 bar were to be investigated in the course of testing, it was not possible to use any production GDI injector. This is why a modified production diesel injector was employed. On

Supercritical Fluid

Looking at the states a substance can assume in relation to pressure and temperature, it is necessary to distinguish between solid state, liquid and gaseous. These states can be presented in the phase diagram, Figure 11. Temperature [K] If the so-called critical point is reached by increasing substance pressure and temperature, the substance exists in

Relationship between Temperature and Jet Breakup

The Reynolds number and Ohnesorge number include temperature-related variables. The Reynolds number incorporates liquid density and dynamic viscosity. These physical properties are directly related to temperature. Flow velocity to Bernoulli is indirectly related to temperature. As such, the Reynolds number is calculated on the basis of Re = u(p(T ))• D• p(T) M,(T) The Ohnesorge