Study of Cavitation on a Gerotor pump using GT-SUITE
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1 GT Conference 2017 May Study of Cavitation on a Gerotor pump using GT-SUITE E. FROSINA, A. SENATORE, D. BUONO, F. P. BOVE DEPARTMENT OF INDUSTRIAL ENGINEERING, UNIVERSITY OF NAPLES FEDERICO II, VIA CLAUDIO 21, NAPLES 80125, ITALY
2 Prof. Ing. Adolfo Senatore University of Naples Federico II Dr. Emma Frosina Post Doc University of Naples Federico II Dr. Francesco Paolo Bove Borsista University of Naples Federico II Dr. Fulvio Domenico Schiano di Cola Tesista University of Naples Federico II Dr. Dario Buono Post Doc University of Naples Federico II Dr. Francesco Mele Borsista University of Naples Federico II Dr. Rosario Iannuzzi Tesista University of Naples Federico II
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5 E. Frosina, Frosina, Study Study of of Cavitation Cavitation on on aa Gerotor Gerotor pump pump using with GT-SUITE E. GT-SUITE T Conference GT Conference May May
6 Outlook Introduction Test Equipment and Measuring Method 1D Simulation Model Results Conclusions
7 Introduction ENGINE DESCRIPTION Engine: 2 cylinder Displacement: 875,4 cm3 Max Power: 80 kw at 5500 rpm Max Torque: 145 Nm at 1900 rpm
8 Introduction PUMP Outer Gear: 10 Teeth Inner Gear: 9 Teeth Displacement: 5.2 cm3/rev
9 Introduction NO CAV CAV NO CAV CAV
10 Test Equipment and Measuring Method P1 = Mean Delivery Pressure Transducer P2 = Mean Suction Pressure Transducer P3 = Instantaneous Delivery Chamber Pressure Transducer P4 = Instantaneous Suction Chamber Pressure Transducer Q = Flow Meter R1 = Suction Throttle Valve R2 = Suction Calibrated Orifice R3 = Delivery Calibrated Orifice R4 = Delivery Throttle Valve
11 Test Equipment and Measuring Method
12 Test Equipment and Measuring Method Calibrated Delivery Orifices Suction E. Frosina, Study of Cavitation on a Gerotor pump pump with 1D Modelling Approach E. Frosina, Study of Cavitation on a Gerotor using GT-SUITE T Conference GT Conference May May
13 Test Equipment and Measuring Method E. Frosina, Study of Cavitation on a Gerotor pump pump with 1D Modelling Approach E. Frosina, Study of Cavitation on a Gerotor using GT-SUITE T Conference GT Conference May May
14 Test Equipment and Measuring Method Oil Properties Full Synthetic 5W40 Long Life Engine Oil Viscosity (ASTM D445) C / 100 C Viscosity Index 176 Sulphated Ash (ASTM D874) 1,3 wt % Phosphorous 0,1 Flash Point (ASTM D92) 231 C Density (ASTM D4052) 0,85 C Total Base Number (ASTM D2896) 11,8 MRV (ASTM D4684) 24, C HTHS Viscosity (ASTM D4683) 3,9 mpa 150 C
15 1D Simulation Model The 1D pump flow model is discretized into many volumes comprised of pipes and flow splits (volumes), and pipe passages are further discretized into sub volumes. The 1D Navier-Stokes equations, namely conservation of mass, momentum and energy are solved every time step in every sub volume. Conservation of species is also considered to solve for species transport throughout the system. In the figure, the flow volumes used in the model are shown by alternating colors. Both the inlet and outlet ports are divided into three sections for more accurate wave propagation through the port. Discretization of flow passages in the 1D model
16 1D Simulation Model 16 Since the pump has 10 outer teeth, there are 10 chamber volumes, and one cycle of the pump is represented as one revolution of the outer gear. The flow path from the oil pan to the chamber volumes is highlighted in blue, while the flow path from the chambers to the outlet is highlighted in red. The leakage path between chambers is highlighted in green. The changing volume in each "Vol1", Vol2", etc part pulls the oil from the pan into each chamber as its volume expands. Then when the volume in each chamber compresses, the oil is forced to the outlet side of the pump. The internal leakage between each chamber is modeled with parts "gap1", "gap2", etc
17 1D Simulation Model Three internal leakage paths are used in the model. The dominant path is highlighted green (leakage between teeth), the two minor paths are highlighted orange and pink.
18 1D Simulation Model The 1D model was built directly from the CAD model of the pump using the GEM3D preprocessor of GT-SUITE.
19 1D Simulation Model There are three distinct sections for both the inlet and outlet ports, to represent the flow area between the pumping chambers and these port sections. The model has 133 total flow volumes, 110 of which are pipe sub-volumes
20 1D Simulation Model Free/dissolved gas is included in the model, based on Henry s Law A time constant is used to control the rate at which air goes from dissolved free state and vice versa The amount of gas that can be dissolved in a liquid at steady state is proportional to the pressure and dependent on the Bunsen coefficient, B The Bunsen coefficient for oil/air mixtures is on the order of V gas d, ss (1bar,273 K ) BVliq P Patm Gas dissolved The model assumes no free air at the oil pickup tube inlet, but 100% dissolved air in the oil B Pressure E. Frosina, Study of Cavitation on a Gerotor pump using GT-SUITE
21 Results Comparison between model results and experimental data with a Toil of 800C and a suction tube orifice diameter of 15mm
22 Results Comparison with different suction tube orifice diameters, while holding outlet pressure at 3 bar and 800C NO CAV MASS FLOW-RATE CAV pout = 3 bar
23 Results Comparison with different suction tube orifice diameters, while holding outlet pressure at 3 bar and 800C SUCTION PRESSURE pout = 3 bar
24 Results 3000rpm TOIL=80 C PDELIVERY [bar] PDELIVERY [bar] 3000rpm TOIL=80 C Angle [deg] NO CAV Angle [deg] CAV
25 Results Pressure pulsation comparison at 3000 RPM and 800C 15mm NO CAV 5mm CAV
26 Results Influence of oil type and suction tube diameter on pump mass flow Toil = 200C Toil = 800C
27 Conclusions A numerical and experimental investigation on the cavitation in a gerotor oil pump has been done. The pump has been forced to cavitate varying the suction pressure. An experimental investigation has been performed by the University of Naples Federico II on a hydraulic test bench.
28 Conclusions The Pump performance in no-cavitating and cavitating conditions has been measured; these data have been used to compare to the 1D simulation model. The comparison between the model results and experimental data has shown a good accuracy with a maximum gap of 7%. The model has demonstrated to correctly predict cavitation
29 Work in Progress The model is able able to predict the power request of the pump Study of other Getoror pumps
30 Work in Progress Gerotor pump cavitation Fault Diagnosis Study of other pumps like the vane pumps and the piston pumps
31 GT Conference 2017 May THANK YOU FOR YOUR ATTENTION Emma Frosina
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