Browsing by Author "Vincent, Abhay"

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    Computational approach for investigating nanoscale interfacial ice adhesion trends
    (Royal Society of Chemistry, 2023-12-12) Vincent, Abhay; Pervier, Marie; Pervier, Hugo; Nalianda, Devaiah
    For developing high performance, low-energy ice protection systems, it is vital to understand the icing physics at the interface of the ice and substrate. Macroscopic experiments have known limitations when it comes to explaining the adhesion characteristics of ice. There is a need to look at the microscale behaviour of ice and how it interacts with the surface it adheres on. The article describes application of molecular dynamics to the ice-substrate problem by modelling two major modes of ice adhesion test – tensile and shear tests, which are used for ice adhesion strength determination. The coarse-grained model of water is nucleated to form ice at the temperature which is designated for ice adhesion test on a macroscopic level. Steered molecular dynamics (SMD) is then applied to the nucleated ice cube to then obtain tensile and shear adhesion strengths over various FCC surface morphologies that represent the crystal structure of metallic substrates. The results obtained from the adhesion simulations are then used to compare the nanoscale trends on ice adhesion to the macroscale ice adhesion trends. The simulation results show that while contact area and temperature variations have similar trends to the observed macroscopic trends, other variations like tensile and shear loading rate variation at the nanoscale are not directly understood from macroscopic interpretations of ice adhesion.
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    Experimental rig for ice accretion and adhesion strength measurement for air cycle machine system
    (Elsevier, 2023-06-06) Vincent, Abhay; Pervier, Marie L. A.; Pervier, Hugo; Nalianda, Devaiah; West, Peter; Agustin-Saenz, C.; Brusciotti, F.
    Air cycle machines (ACM) which are part of the air-conditioning pack in every aircraft, are one such turbomachinery device that can be affected by icing issues particularly at the turbine end. Current ice protection solutions for the air cycle machines use a heating system on the downstream pipe to heat the surface, using electric resistance heaters or hot air coming from the ACM compressor stage. Both solutions require high energy, hence the need to reduce energy consumption through the development of passive energy-saving solutions. Clean Sky 2 ERICE project aims at developing an eco-friendly and cost-effective hydrophobic / ice-phobic solution able to resist ice adhesion in the ACM turbine scroll and its downstream pipe. This paper discusses the implementation of an experimental rig to reproduce the ice formation and accretion conditions within the ACM and a new shear test method to measure the ice adhesion strength on existing and new solutions in the form of coatings. The flow through the ACM turbine exhaust has also been characterized for the first time in published literature. The results from the ice accretion and adhesion tests show that hydrophobic coatings developed for the purposes of ice protection perform better than the current industry baseline material for ACM turbine scroll pipe internal surface. While these coatings could not be used to prevent accretion, they do help in reducing adhesion of ice to the surface.
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    High Speed Camera Tests - ERICE
    (Cranfield University, 2023-06-06 14:25) Vincent, Abhay; Pervier, Marie; Pervier, Hugo
    This item contains the data from the High speed camera tests for ERICE project based on conditions 1 and 2 of the test matrix. Data includes: 1) High Speed camera videos for two test conditions (x2) - '.avi' format 2) Labview files (x2) - '.lvm' format (read with MS Excel) 3) README txt file (x1) - explaining the headers for the labview data and the instrumentation involved. Test 1 refers to the 50k RPM condition from the test matrix and Test 2 refers to the 60k RPM condition from the test matrix.
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    Malvern Tests - ERICE
    (Cranfield University, 2023-06-06 14:25) Vincent, Abhay; Pervier, Marie; Pervier, Hugo
    This item contains the data from the tests done for characterization of flow using Malvern Particle Analyzer for the ERICE project. Data includes: 1) Labview files (x2) - '.lvm' format (to be read with MS Excel), 2) Excel sheet with data post-processing (x2) - '.xlsx' format (to be read with MS Excel), 3) Test run video files (x2) - '.mkv' files, 4) README txt file (x1) - explaining the headers for the labview data and the instrumentation involved. Test 1 refers to the test run at 60k RPM & Test 2 refers to the test run at 50k RPM
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    Measurement and FEM of ice adhesion to the downstream pipe of an air cycle machine
    (Elsevier, 2022-02-07) Feng, An; Vincent, Abhay; Pervier, Marie L. A.
    Ice accretion on the downstream pipe of an air cycle machine can lead to pipe blockage and turbine blade damage, and therefore de-icing is needed. Most previous studies focused on ice shedding from flat surfaces, and average interface shear strength rather than the true shear strength was usually reported. Here, the debonding of the interface between ice and cylindric surfaces of an aluminium pipe (2024-T3) was studied trying to understand the mechanism of interface fracture and to obtain the true adhesive shear strength and fracture energy. Average adhesive strength was measured first in the scrape test and the result was used to calibrate the finite element analysis. A cohesive zone model (CZM) with bilinear traction-separation law was used to simulate the interface delamination. The true shear strength σcs and mode-II energy release rate Gcs were determined by matching the numerically predicted critical force to the measured force. The influence of shear strength and shear energy release rate on the critical force was also investigated. At the interface, both the damage factor and the peak shear stress were found progressing away from the edge as the pushing force increased. Parametric studies on the influence of the length of the interface was performed. The critical force first increased and then stabilised with the increase of the length, showing the same trend as that of a theoretical model which ignored the mode-I fracture.
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    README [Test Matrix & Description - ERICE]
    (Cranfield University, 2023-06-06 14:25) Vincent, Abhay; Pervier, Marie; Pervier, Hugo
    The item consists of a presentation ('pptx' format) which describes the two distinct test matrix conditions for the ERICE tests and a text file which describes the process of all the various tests performed within this research work. These conditions were used for all the testing done within the ERICE project.
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    Test Matrix Condition 1 Tests - ERICE
    (Cranfield University, 2023-06-06 14:26) Vincent, Abhay; Pervier, Marie; Pervier, Hugo
    This item contains the condition 1 tests conducted under ERICE. These tests were done at 60k RPM of the turbocharger and were only to observe the ice accretion and no scrape tests were performed for tests in these conditions. The item includes the following data: 1) Labview files (x8) - '.lvm' format (read with MS Excel) 2) Video files (x8) - '.mkv' format 3) README txt file (x1) - explaining the headers for the labview data and the instrumentation involved - Test 1 refers to Wearlon sample; Test 2 refers to AA Fsmooth sample; Test 3 refers to Al sample; Test 4 refers to AA F75 sample; Test 5 refers to Thin SAA + TCS sample; Test 6 refers to Thin SAA + PTFE; Test 7 refers to Xylan sample; Test 8 refers to WSAA Fsmooth sample
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    Test Matrix Condition 2 Tests - ERICE (Scrape Test Data)
    (Cranfield University, 2023-06-06 14:26) Vincent, Abhay; Pervier, Marie; Pervier, Hugo
    This item contains the details of the 40 total successful test runs for the Condition 2 of the ERICE test matrix. Ice was accreted using this condition and then tested in the Scrape Test setup to obtain adhesion test values for 8 samples. The item consists of the following data types: 1) Labview files for rig sensors (x39) - ".lvm" format - to be read using Excel, 4th test for Xylan had no file due to recording error 2) Labview files for scrapetest (x41) -.lvm format" - to be read using MS Excel 4th test for Xylan had no file due to recording error extra test for AA Fsmooth 5th test 3) Video files (x39) - ".mkv" format 4) Color-coded test matrix (x1) - ".xlsx" format - to be read using MS Excel 5) README txt file (x1) - explaining the headers for the labview data and the instrumentation involved. Each sample apart from AA Fsmooth has 5 tests completed and are labelled in that order. AA Fsmooth has an extra test and hence the scrapetest files are labelled as 5a and 5b."
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    Trace-wire Tests - ERICE
    (Cranfield University, 2023-06-06 14:25) Vincent, Abhay; Pervier, Marie; Pervier, Hugo
    This item contains the data from the trace-wire testing performed for the ERICE project. The following files are present within this item: 1) Labview files (x3) - ".lvm" format (to be read in MS Excel) 2) Video files (x3) - ".mkv" format 3) README txt file (x1) - explaining the headers for the labview data and the instrumentation involved. Test 1 refers to Aluminium sample Test 2 refers to Wearlon sample Test 3 refers to AA Fsmooth sample