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1

Prediction of secondary flow losses in an entrance duct to a low-pressure turbine

Jonak P., Borzęcki T., Kubacki S.

Archives of Mechanics

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2019

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Vol. 71, nr 1

65--90

EN

Secondary flow features and total pressure losses by means of the total pressure loss coefficient are discussed in an entrance duct, named a turbine central frame (TCF), to a four-stage low-pressure turbine (LPT) of aero-engine. The massaveraged total pressure losses are also analysed at outlets from selected components of the low-pressure turbine. The Reynolds-averaged Navier–Stokes (RANS) technique has been employed for prediction of mean flow characteristics. The numerical results are compared with experimental data obtained in Polonia Aero Lab in Zielonka (Poland). Good agreement is obtained between measured and predicted global flow characteristics and the pressure coefficient on a surface of an inlet guide vane. The high values of the loss coefficient are observed at endwalls, in cores of streamwiseoriented vortex structures near to the endwalls and in the wakes behind the vanes. It is found that the endwall losses contribute by far the most to the total losses at the outlets from the turbine central frame and first vane-row and they become lower at an outlet f rom the first blade-row and at outlets form consecutive vane- and blade-rows.

2

Flow noise correlation with efficiency and vibration level - two-stage turbine case

Błaszczak J. R.

Systems : journal of transdisciplinary systems science

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2006

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Vol. 11, nr 1

8-15

EN

The objective of the presented test program was to investigate flow effects influence on the performance, noise and vibration levels of a two-stage low-pressure turbine. Measurement results for different circumferential positions of the turbine vanes are described to determine how noise and vibration could be affected by airfoil indexing and flow condition changes. Two cases are presented: for nominal rotational speed of the machine and for off-design turbine conditions (highly-loaded turbine case). Results showed some possibilities of a future turbomachinery performance and reliability improvement. In addition, another way to reduce noise emitted by a turbomachine and to lower vibration level is demonstrated. The investigations have been carried out at the Institute of Turbomachinery (Instytut Maszyn Przepływowych, IMP), Technical University of Lodz, Poland.

3

Badania wpływu wzajemnego położenia kierownic na sprawność dwustopniowej turbiny modelowej

Smolny A.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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2000

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nr 116

9--16

PL

Wykonano badania wpływu wzajemnego położenia kierownic dwustopniowej turbiny na jej charakterystyki zewnętrzne (przepływ, moment, sprawność) dla 5 punktów pracy turbiny. Badania mają duże znaczenie dla optymalnego ustawienia wzajemnego kierownic w wielostopniowych maszynach przepływowych.

EN

This paper concern experimental investigations conducted for detailed studies of the clocking effect in a two-stage low pressure turbine. Paper describes details of the test facility and aerodynamic operating parameters. Measured turbine efficiency was used to quantify the effect of stator clocking positions on turbine performance.