A Robust Adiabatic Model for a Quasi-Steady Prediction of Far-Off Non-Measured Performance in Vaneless Twin-Entry or Dual-Volute Radial Turbines

Serrano, José Ramón; Arnau, Francisco José; García-Cuevas, Luis Miguel; Samala, Vishnu

doi:10.3390/app10061955

Cited by 6 publications

(30 citation statements)

References 44 publications

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“…The actual mass flow rate at each entry of the turbine was controlled by two control valves, as shown in Figure 3. 4. It is worth highlighting that the pressures and temperatures in each turbine were not explicitly controlled.…”

Section: Test Methodologymentioning

confidence: 99%

“…The blade speed ratio is defined as the ratio between the blade tip speed and the isentropic velocity of a nozzle, as shown in Equation 2. 4.…”

Section: Turbine Performance Datamentioning

confidence: 99%

“…It is expressed by the Equation 2.56, referring to the Figure 2. 4. Where p 2 and p 3 are the pressures at the outlet of the compressor wheel and the inlet of the turbine wheel respectively and, in the previous equations, A comp and A turb are the effective areas of the compressor and turbine wheels.…”

Section: N Umentioning

confidence: 99%

“…The works, analysis and ideas described in this chapter were the origins of publication number [4] from the publications list of the author of this thesis. In the sake of readiness and to protect the thesis writing style the publication number [4] [4] listed in the referred section.…”

Section: Mass Flow and Efficiency Models For Double-entry Turbines 41 Introductionmentioning

confidence: 99%

“…As shown in Figure 3.3, downstream of the combustion chamber, the airflow is branched into two pipes, which are called as Turbine Entry 1 (for Sh/LV) and Turbine Entry 2 (for H/SV), referring to their positions shown in Figure 3. 4. Each of these branches is instrumented with a V-cone type sensor for measuring the air mass flow rate and a control valve for varying the flow going into the branches.…”

mentioning

confidence: 99%

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

Samala¹

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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.

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Section: Test Methodologymentioning

confidence: 99%

“…The blade speed ratio is defined as the ratio between the blade tip speed and the isentropic velocity of a nozzle, as shown in Equation 2. 4.…”

Section: Turbine Performance Datamentioning

confidence: 99%

Section: N Umentioning

confidence: 99%

Section: Mass Flow and Efficiency Models For Double-entry Turbines 41 Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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

Samala¹

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Using a CFD analysis of the flow capacity in a twin-entry turbine to develop a simplified physics-based model

Galindo

Serrano

Medina

2021

Aerospace Science and Technology

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An Experimental and Modelling Strategy for Obtaining Complete Characteristic Maps of Dual-Volute Radial Inflow Turbines

Serrano

Arnau

Samala

et al. 2020

Volume 8: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine; Microturbines, Turbochargers, and Small

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Despite the importance of turbocharged engines with radial inflow dual-volute turbines, their characteristic maps and fully predictive modelling using 1D gas dynamic codes are not well established yet. The complexity of the unsteady flow and the unequal admission of these turbines, when operating with pulses of engine exhaust gas, makes them a challenging system. This is mainly due to the unequal flow admission, which generates an additional degree of freedom with respect to well-known single entry vanned or vaneless turbines. This paper has as a main novelty a simple procedure for characterizing experimentally and elaborating characteristic maps of these turbines with unequal flow conditions. This method of analysis allows for easy interpolation within the proposed characteristic maps or conceiving simple models for calculating and extrapolating full performance parameters of dual-volute turbines. Here, also described are two innovative 0D mean-line models that require a minimum quantity of experimental data for calibrating both: the mass flow parameter model and the isentropic efficiency model. Both models are predictive either in partial or unequal flow admission conditions using as inputs: the mass flow ratio between branches; the total temperature ratio between branches; the blade to jet speed ratio in each branch and the pressure ratio in each branch. These six inputs are generally instantaneously provided by 1D gas-dynamics codes. Therefore, the novelty of the model is its ability to be used in a quasi-steady way for dual-volute turbines performance prediction. This can be done instantaneously when turbines are calculated operating at turbocharged engines under pulsating and unequal flow conditions.

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A Robust Adiabatic Model for a Quasi-Steady Prediction of Far-Off Non-Measured Performance in Vaneless Twin-Entry or Dual-Volute Radial Turbines

Cited by 6 publications

References 44 publications

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

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

Using a CFD analysis of the flow capacity in a twin-entry turbine to develop a simplified physics-based model

An Experimental and Modelling Strategy for Obtaining Complete Characteristic Maps of Dual-Volute Radial Inflow Turbines

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