Separation in Double Entry Turbine Housings at Boosted Gasoline Engines

Lückmann, Dominik; Uhlmann, Tolga; Kindl, Helmut; Pischinger, Stefan

doi:10.1007/s38313-013-0094-4

Cited by 8 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(Nguyen-Schäfer [10]). The generalized Reynolds lubrication equation governs the pressure distributions ( , , ) and ( , , ) for the inner and outer oil films (only squeeze effect), according to Equation (4).…”

Section: ∂ ∂X ρH 12ηmentioning

confidence: 99%

“…On the one hand, special attention is given to improve the aerodynamic efficiency (e.g., variable nozzle TC (O'Conner and Smith [3]) or twin scroll turbines (Lückmann et al [4]); on the other hand there are intensive research activities in the field of the turbocharger bearing systems and their resulting mechanical losses. In [5,6] it was shown that there is still significant potential for increasing effective turbine efficiencies, especially in the context of mechanical losses.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Non-Linear Rotor Dynamics on the Bearing Friction of Automotive Turbochargers

et al. 2017

Self Cite

View full text Add to dashboard Cite

Abstract:One of the possibilities to increase the efficiency of an internal combustion engine is to enhance its interaction with the charging system. With the help of new advanced simulation tools, the rotor dynamic behavior and bearing friction losses of turbochargers (TC) can be quantified in the early stage of the development process. This procedure enables virtual bearing development, leading to shortened development times and reduced testing costs. This paper presents a detailed view of the findings in current research; focusing on rotor dynamic simulations with emphasis on the non-linear dynamics (oil whirl; oil whip) and their impact on bearing friction losses. In order to obtain a detailed understanding of these effects; elastic multibody simulations (EMBS) with elastic hydrodynamic bearing (EHD) analysis including a mass-conservative approach are used. Measurement data is obtained using a unique test bench which is designed to quantify the bearing friction losses by means of a drag test. Additionally, hot gas test bench measurements are carried out to assess the non-linear rotor dynamics during steady state operation using shaft motion measurement equipment. In the first step; a multibody simulation model of a common automotive TC is set up; and a model of the friction test bench is mapped into it. The author will show that there is a high agreement between simulated and measured friction losses. In the second step; the TC model is detached from the virtual test bench and a variation of the essential parameters are carried out to identify the influence of the non-linear rotor dynamics on the bearing friction. A final model validation is obtained by comparing the measured shaft orbits for the TC hot gas test bench with the results from the multibody simulation.

show abstract

Section: ∂ ∂X ρH 12ηmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Non-Linear Rotor Dynamics on the Bearing Friction of Automotive Turbochargers

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, the M F R is proportional to the ratio of power in one branch to the total turbine power. Further, it keeps much of velocity ratio (Mach ratio) generalization effects that comes from RM F R parameter [28,29]. It means that the ratio of Mach numbers is very similar to the ratio of mass flows.…”

Section: Test Methodologymentioning

confidence: 94%

“…RMFR is a ratio of the reduced mass flow of one branch to the total reduced mass flows in the other two branches of the turbine. The outcomes of the measurement on the testbed with two combustion chambers are discussed in [29].…”

Section: Experimental Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Experimental characterization and mean line modelling of twin-entry and dual-volute turbines working under different admission conditions with steady flow

Samala¹

View full text Add to dashboard Cite

Despite the importance of radial in-flow twin-entry and dual-volute turbines for turbocharged engines, their characteristic maps and fully predictive modelling using 1D gas dynamic codes are not well established yet. The complexity of the un-steady flow and the unequal admission of these turbines, when operating with pulses of engine exhaust gas, make them a challenging system. Mainly due to the unequal flow admission, an additional degree of freedom is introduced to well-known single entry vanned or vaneless turbines. Moreover, the addition of the second inlet to the turbine volute brings extra complexity in determining the steady-state turbine performance parameters under unequal admission conditions. This thesis has a main novelty, which is a simple procedure for characterizing experimentally and elaborating characteristic maps of these turbines with unequal flow conditions. This method of analysis allows easy interpolating within the proposed distinctive maps or simple convincing models for calculating and extrapolating full performance parameters of twin-entry and dual-volute turbines.Finally, the models have been fully validated by coupling them with one-dimensional modelling software and simulated both the gas stand and the whole engine measured points. On the one hand, the validation results from the gas stand simulation show that the model can predict well all steady flow variables. On the other hand, the validation results from the whole engine simulation show that the model is able to produce all the full load engine variables like air mass flow and brake torque in a reasonable degree of agreement with the experimental data.

show abstract