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Fundamental Experiments on Electrospray Propulsion: Propellants, Plumes, and Material Interactions
Fundamental Experiments on Electrospray Propulsion: Propellants, Plumes, and Material Interactions
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105657
- ISBN
- 9798265453211
- DDC
- 620.11
- 서명/저자
- Fundamental Experiments on Electrospray Propulsion: Propellants, Plumes, and Material Interactions
- 발행사항
- [Sl] : University of Illinois at Urbana-Champaign, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 154 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisor: Rovey, Joshua.
- 학위논문주기
- Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2024.
- 초록/해제
- 요약Electrospray sources are devices that use electric fields to extract charged particles directly from a liquid surface. Those charged particles may span a large mass range, from single molecular ions (102 amu/q) to large droplets (105 amu/q), depending on the type of electrospray source and its operating conditions. Species in electrospray plumes are heavier than most ion sources (e.g., a Hall-effect thruster), making electrospray appealing for applications such as spacecraft propulsion and material etching.The distribution of mass and energy within the plume determines the performance of an ion source for a given application. In a propulsion context, those distributions may be used to calculate thrust, specific impulse, and efficiency. However, accurately measuring those distributions can be challenging. Part 1 of this dissertation describes a tandem energy analyzer/mass spectrometer for measuring the mass and energy distributions in electrospray plumes. The instrument was used to characterize a capillary emitter plume and the plume of an ionic liquid ion source (ILIS). The ILIS data was used to calculate the mean lifetime of ion clusters in the electrospray plume. For the ILIS used here, operated with the ionic liquid EMI-BF4, we calculate that the EMI+[EMI][BF4] dimer mean lifetime ranges from 3.5 ns to 142 ns for electric field strengths ranging from 35 V/µm to 2 V/µm, respectively. Similarly, the EMI+([EMI][BF4])2 trimer has an estimated lifetime of 0.9 ns to 13 ns for electric field strengths ranging from 22 V/µm to 2 V/µm, respectively. From those data, we estimate the temperature and solvation energy of positive EMI-BF4 dimers is T=471±216 K and ΔG=0.62±0.26 eV, respectively. Similarly, for positive trimers we estimate that T=475±422 K and ΔG=0.55±0.43 eV. These results are among the first to use empirical methods to estimate EMI-BF4 cluster lifetimes, temperature, and solvation energy.Part 2 of this dissertation discusses other topics in electrospray propulsion. We present a "Secondary Species Emission" (SSE) probe designed to measure secondary charge emission from surfaces bombarded by electrospray plumes. Further, we demonstrate that the SSE probe can be operated in tandem with the energy analyzer/mass spectrometer to measure SSE yield as a function of the mass and energy of incident plume species. The ability to discriminate between different species and energies is a novel and significant advance in secondary charge emission measurements. Part 2 continues, presenting the first successful demonstration of a prototype thruster that combines electrospray and monopropellant functionality into a single device. Finally, Part 2 concludes with an investigation of water removal from ionic liquid electrospray propellants.
- 일반주제명
- Materials science
- 일반주제명
- Aerospace engineering
- 일반주제명
- Electrical engineering
- 일반주제명
- Engineering
- 기타저자
- University of Illinois at Urbana-Champaign Aerospace Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105657
■006m o d
■007cr#unu||||||||
■020 ▼a9798265453211
■035 ▼a(MiAaPQ)AAI32409786
■035 ▼a(MiAaPQ)124615
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620.11
■1001 ▼aLyne, Christopher.
■24510▼aFundamental Experiments on Electrospray Propulsion: Propellants, Plumes, and Material Interactions
■260 ▼a[Sl]▼bUniversity of Illinois at Urbana-Champaign▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a154 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisor: Rovey, Joshua.
■5021 ▼aThesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2024.
■520 ▼aElectrospray sources are devices that use electric fields to extract charged particles directly from a liquid surface. Those charged particles may span a large mass range, from single molecular ions (102 amu/q) to large droplets (105 amu/q), depending on the type of electrospray source and its operating conditions. Species in electrospray plumes are heavier than most ion sources (e.g., a Hall-effect thruster), making electrospray appealing for applications such as spacecraft propulsion and material etching.The distribution of mass and energy within the plume determines the performance of an ion source for a given application. In a propulsion context, those distributions may be used to calculate thrust, specific impulse, and efficiency. However, accurately measuring those distributions can be challenging. Part 1 of this dissertation describes a tandem energy analyzer/mass spectrometer for measuring the mass and energy distributions in electrospray plumes. The instrument was used to characterize a capillary emitter plume and the plume of an ionic liquid ion source (ILIS). The ILIS data was used to calculate the mean lifetime of ion clusters in the electrospray plume. For the ILIS used here, operated with the ionic liquid EMI-BF4, we calculate that the EMI+[EMI][BF4] dimer mean lifetime ranges from 3.5 ns to 142 ns for electric field strengths ranging from 35 V/µm to 2 V/µm, respectively. Similarly, the EMI+([EMI][BF4])2 trimer has an estimated lifetime of 0.9 ns to 13 ns for electric field strengths ranging from 22 V/µm to 2 V/µm, respectively. From those data, we estimate the temperature and solvation energy of positive EMI-BF4 dimers is T=471±216 K and ΔG=0.62±0.26 eV, respectively. Similarly, for positive trimers we estimate that T=475±422 K and ΔG=0.55±0.43 eV. These results are among the first to use empirical methods to estimate EMI-BF4 cluster lifetimes, temperature, and solvation energy.Part 2 of this dissertation discusses other topics in electrospray propulsion. We present a "Secondary Species Emission" (SSE) probe designed to measure secondary charge emission from surfaces bombarded by electrospray plumes. Further, we demonstrate that the SSE probe can be operated in tandem with the energy analyzer/mass spectrometer to measure SSE yield as a function of the mass and energy of incident plume species. The ability to discriminate between different species and energies is a novel and significant advance in secondary charge emission measurements. Part 2 continues, presenting the first successful demonstration of a prototype thruster that combines electrospray and monopropellant functionality into a single device. Finally, Part 2 concludes with an investigation of water removal from ionic liquid electrospray propellants.
■590 ▼aSchool code: 0090.
■650 4▼aMaterials science
■650 4▼aAerospace engineering
■650 4▼aElectrical engineering
■650 4▼aEngineering
■653 ▼aElectrospray propulsion
■653 ▼aIon beam diagnostics
■653 ▼aMass spectrometry
■653 ▼aElectrospray sources
■653 ▼aSecondary Species Emission
■690 ▼a0538
■690 ▼a0544
■690 ▼a0794
■690 ▼a0537
■71020▼aUniversity of Illinois at Urbana-Champaign▼bAerospace Engineering.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■790 ▼a0090
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361044▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
